Plant bioactive compounds: extraction, biological activities, immunological, nutritional aspects, food application, and human health benefits—A comprehensive review

In recent years, there has been a growing awareness of the importance of a nutritious diet for maintaining overall health. Among dietary components, plant-derived bioactive compounds have garnered significant attention due to their functional properties and potential to prevent various diseases. These bioactive constituents, although typically present in small quantities, provide substantial health benefits and are considered non-nutritive yet physiologically active components of the diet. Medicinal plants, vegetables, fruits, cereals, sauces, and spices have become focal points in nutritional research, owing to their diverse array of bioactive compounds. These compounds, including polyphenols, glucosinolates, carotenoids, terpenoids, alkaloids, saponins, vitamins, and dietary fibers, are increasingly recognized for their ability to reduce the risk of chronic diseases, as demonstrated by epidemiological studies. These molecules exhibit a broad spectrum of therapeutic activities, including antioxidant, anti-inflammatory, anti-atherogenic, antimicrobial, antithrombotic, cardioprotective, and vasodilatory activities. Despite their promising pharmacological and nutritional potential, the integration of plant-derived bioactive compounds into commercial products remains limited. Importantly, bioactive compounds that possess antioxidant and antimicrobial activities are increasingly acknowledged for their potential application as natural and environmentally sustainable food preservatives. The expanding interest in these applications underscores the critical need for efficient and standardized extraction methods. While conventional extraction techniques have been widely used, they often suffer from limitations such as low yield, degradation of heat-sensitive compounds, and high solvent consumption. To address these challenges, innovative and integrated extraction technologies have been developed, offering advantages such as enhanced extraction efficiency, reduced impurities, and lower environmental impact. These methods often employ reduced solvent use and energy input, aligning with sustainability goals. This review aims to provide a comprehensive overview of bioactive plant compounds by examining their extraction methods, biological and immunological activities, nutritional significance, food applications, and health benefits for humans.

1 Introduction

With growing recognition of nutrition as a cornerstone of human health, dietary patterns have emerged as a critical area of research within the global food industry (1). Over recent decades, substantial evidence has established a strong correlation between diet and overall wellbeing, prompting modern consumers to adopt more health-conscious and preventive dietary choices (1). This shift in consumption patterns largely stems from heightened health awareness and a growing demand for an enhanced quality of life (1, 2). This growing interest has catalyzed numerous studies aimed at improving the nutritional quality of foods and investigating the potential benefits of incorporating novel bioactive compounds with targeted functional properties (1, 2). Accumulating scientific evidence indicates that chronic stress, in combination with unhealthy lifestyle choices, can synergistically impair immune function (2). This immunosuppression increases susceptibility to infectious diseases, malignancies, cardiovascular disorders, and a range of chronic health conditions (2).

Consequently, healthcare professionals, food manufacturers, researchers, and consumers alike are increasingly focused on the therapeutic potential of specific dietary components (3). In today's health-conscious society, the timeless adage, “Let food be thy medicine and medicine be thy food,” resonates more strongly than ever, emphasizing the integral role of nutrition in both disease prevention and healing (3). As public awareness of the relationship between nutrition and health continues to increase, there has been a substantial growth in the global market for nutraceuticals and functional foods (4).

Various bioactive compounds have been incorporated into functional foods, nutraceuticals, and pharmaceuticals due to their antimicrobial characteristics and humoral and cell-mediated immune functions, aiding disease prevention and control (5). Functional foods originated in 1980 when Japan's Ministry of Health and Welfare established nutritional criteria for foods with health-enhancing properties (6). These foods are classified as “functional” when they demonstrate scientifically validated benefits that extend beyond basic nutrition, targeting specific physiological functions to improve overall health and reduce disease risk (7, 8).

Functional foods have grown in global demand as consumers increasingly integrate them into regular dietary patterns (9). Market assessments forecast significant growth in this area, with the functional food business anticipated to increase from USD 161.99 billion in 2020 to USD 228.79 billion by 2025, reflecting a compound annual growth rate (CAGR) of almost 8% (9). In both scientific literature and commercial discourse, these products are often referred to interchangeably as “natural health products” or “healthy foods,” reflecting their dual roles in nutrition and disease prevention (10).

Functional foods encompass both natural and processed food products that deliver clinically demonstrated health benefits extending beyond their fundamental nutritional value (11). Historically, phytotherapeutics have been utilized for the treatment of a wide range of ailments across various cultures (11). According to the World Health Organization (WHO), approximately 80% of the global population still relies primarily on traditional medicinal practices for primary healthcare needs. Within this context, plant-derived bioactive compounds are recognized as vital contributors to preventive health strategies (12). The plant kingdom represents a vast reservoir of biologically active molecules, including terpenes, polyphenols, limonoids, carotenoids, and saponins, each exhibiting diverse therapeutic properties, such as antioxidant, anti-inflammatory, antimicrobial, and anticancer activities (12, 13).

Traditionally consumed foods such as cereal grains, millets, fruits, vegetables, spices, and condiments are rich sources of functional compounds that confer physiological benefits beyond basic nutritional requirements (14). Plants synthesize diverse bioactive compounds capable of exerting pharmacological or toxicological effects in humans and animals (15). These phytochemicals, encompassing terpenoids, alkaloids, nitrogenous compounds, organosulfur derivatives, and phenolic compounds, are widely distributed across different plant tissues (16). Extensive research has demonstrated their therapeutic potential, with documented health benefits including enhanced circulatory and digestive functions, as well as anti-inflammatory, antineoplastic, and antidiabetic effects (17).

Epidemiological studies indicate that regular consumption of natural functional foods, particularly fruits, whole grains, and vegetables rich in bioactive phytochemicals, is associated with a significantly reduced risk of chronic diseases, including cancer, metabolic syndrome, type 2 diabetes, obesity, and cardiovascular disorders (18, 19). Protective effects are attributed to key bioactive compounds such as ellagic acid, resveratrol, anthocyanins, epigallocatechin, oleuropein, curcumin, sulforaphane, and quercetin (20). Furthermore, plant-derived bioactive molecules with antioxidant and antimicrobial properties offer a sustainable alternative to synthetic food preservatives (21).

The global agro-industry generates vast raw materials, primarily for energy production and human or animal consumption (22). The agri-food processing industry generates more than 190 million tons of by-products yearly, including plant leaves, seed residues, fruit pomaces, cereal brans, fruit skins, and oilseed meals (23). Effective management of these by-products, through recycling, disposal, or valorization, is critical for sustainable practices (24, 25). Many food by-products hold significant economic potential due to their composition and abundance (26). For instance, they can serve as raw materials for extracting functional food ingredients, aligning with current market trends (27). Rich in lipids, carbohydrates, fiber, vitamins, and phenolics, these by-products offer versatile applications (28, 29). The application of bioactive compounds could enhance economic viability, environmental sustainability, and global food security (23).

Plant-derived bioactive compounds present distinct advantages over animal-based alternatives, including higher abundance, cholesterol-free profiles, suitability for vegetarian markets, and cost-effectiveness (30). Consequently, scientific interest in extracting bioactive compounds from plant-derived by-products has grown significantly across developed and developing nations (31, 32).

Optimizing extraction methodologies for bioactive phytochemicals necessitates careful evaluation, particularly for food and pharmaceutical applications, as the selected technique plays a pivotal role in preserving the functional properties, sensory characteristics, and nutritional quality of the target compounds (33). Conventional chemical extraction approaches raise significant concerns, including potential safety hazards, excessive energy consumption, suboptimal product purity, environmental contamination, and toxicological consequences (34). Consequently, there is a pressing need to develop efficient and optimized extraction protocols to maximize the recovery of bioactive compounds. This is particularly important for plant-derived phytochemicals, where the presence of a rigid cell wall matrix can significantly hinder extraction efficiency and yield (34).

Emerging extraction technologies have enabled novel approaches that significantly improve both the yield and accessibility of bioactive compound recovery (35). Environmentally sustainable methods such as ultrasound-assisted extraction (UAE), microwave-assisted extraction (MAE), and pulsed electric field extraction (PEFE) now enable the production of high-quality plant extracts while minimizing environmental impact (36).

Table 1 illustrates the current conventional and emerging methods for extracting bioactive compounds from plants. Figure 1 depicts advanced novel extraction procedures for isolating bioactive chemicals from plant by-products for applications in food additives and medicine.

Table 1

Table 1. Comparison of conventional and novel emerging extraction technologies for isolating bioactive compounds from plant sources.

Figure 1

Figure 1. Innovative extraction methods for isolating bioactive compounds from plant by-products for applications in food additives and medicine.

This review distinguishes itself from existing literature through its unprecedented breadth and depth, integrating six interrelated domains, extraction methodologies, biological activities, immunological functions, nutritional aspects, food applications, and human health benefits into a single comprehensive framework. Unlike prior reviews that typically focus on one or two facets, the present review systematically compares both traditional and cutting-edge extraction techniques, including natural deep eutectic solvents (NADES), ionic liquid extraction (ILE), and hybrid approaches, while also addressing critical regulatory challenges and evaluating economic costs.

By encompassing a temporal scope from 2000 to 2025 and employing rigorous search strategies across PubMed, Scopus, Google Scholar, and Web of Science, the current review provides historical context and captures the latest advances in artificial intelligence (AI)–driven process optimization, biorefinery integration, and nanotechnology-enhanced delivery systems. Furthermore, this work fills notable methodological gaps: it proposes standardized extraction protocols and characterization methods to address the lack of comparability in current studies, emphasizes industrial scalability and commercial viability often overlooked in academic reviews, and rigorously evaluates environmental sustainability through life cycle assessments.

In contrast to single-compound or single-method analyses prevalent in the literature, the present review offers a holistic examination of bioactive compound extraction and application. It also uniquely highlights regulatory harmonization efforts, delving into divergent global frameworks and providing practical guidance for navigating pre-market approvals, safety assessments, and label-claim substantiation.

This review identifies thirteen future research priorities, including the optimization of hybrid extraction technology, regulatory convergence, AI-driven parameter tuning, and circular economy models, thereby combining existing knowledge and providing a clear roadmap for advancing the field. This review comprehensively examines bioactive compounds derived from various plant sources and their byproducts, focusing on extraction methodologies, health benefits, potential applications, and current technological limitations.

2 Methodology

This study provides a comprehensive examination of the pertinent and contemporary literature on bioactive plant compounds, encompassing their classifications, extraction techniques, biological activities, immunological considerations, nutritional properties, and health benefits for humans. To ensure consistency and reproducibility, the precise search approach was used consistently across different databases, including PubMed, Scopus, Google Scholar, and Web of Science.

For PubMed, Scopus, and Web of Science, the following search terms and Boolean operators were used: “bioactive compounds” in combination with terms such as “plant sources,” “agri-food by-products,” “extraction,” “bioactivities,” “health benefits,” “food applications,” and “limitations.” Titles, keywords, and abstracts were initially evaluated for relevance. Full-text publications were then retrieved and included if they were deemed appropriate for an objective and comprehensive evaluation.

For Google Scholar, the search was performed using the same criteria, but without the ability to apply precise filters such as language or date range. Therefore, the results were manually adjusted based on relevance and date.

The present review utilized peer-reviewed articles and reviews, with a date range spanning from 2000 to 2025, modified according to database specifications.

3 Bioactive compounds derived from plant by-products

Comprehensive studies have focused on identifying the diverse array of bioactive substances found in fruit and vegetable peels, which are increasingly acknowledged as significant sources of antioxidants, dietary fiber, polyphenols, and other health-enhancing phytochemicals (37–39). Analytical investigations have revealed that phenolic compound levels in fruit peels, specifically from papaya (Carica papaya), passion fruit (Passiflora edulis), and pomegranate (Punica granatum), consistently reach approximately double the concentrations present in their respective seeds and pulp (33). Comparative analyses indicate that papaya peels exhibit particularly favorable nutritional profiles, characterized by higher mineral content, elevated levels of ascorbic acid, and greater antioxidant activity compared to seeds. These nutritional advantages have been consistently observed across various cultivated papaya varieties (33).

Phytochemical investigations have identified six predominant flavonoid compounds in papaya peel and leaf extracts: myricetin, quercetin, kaempferol, morin, apigenin, and luteolin (33). Comparative phytochemical analyses have revealed that mango (Mangifera indica) peels contain significantly higher concentrations of phenolic acids, particularly gallic acid, and flavonoid compounds such as quercetin, compared to the peels of other fruit species (40). This trend is consistent among tropical fruits, as demonstrated by Sultana et al. (41). Peels of tropical fruits exhibit significantly higher concentrations of gallotannins and total phenolics compared to their corresponding pulp tissues, with mango, mangosteen, and dragon fruit showing particularly pronounced differences (41).

Wolfe et al. (42) conducted a comprehensive analysis of apple (Malus domestica) phytochemicals, revealing that peel tissues contain 3–5 times higher concentrations of flavonoids (particularly quercetin glycosides) and phenolic acids (including chlorogenic acid) than flesh tissues. This pattern is even more pronounced in citrus fruits, where peel phenolic content reaches exceptional levels of 4,500–5,000 mg/g dry weight, approximately 10–15 times greater than concentrations measured in edible portions (43). Citrus fruits (Citrus spp.) are rich in two primary classes of bioactive compounds: phenolic derivatives, such as flavonoids and phenolic acids, and terpenoids, including limonoids and carotenoids (44).

Comparative phytochemical analyses have shown that vegetable peels contain higher concentrations of bioactive compounds than their corresponding edible tissues, reflecting similar trends observed in fruit by-products (33, 45). Vegetable processing, particularly of crops such as tomatoes and eggplants, generates substantial waste, with peels and seeds comprising approximately 40%−60% of the total by-products (33). A sustainable strategy for managing this waste involves recovering high-value bioactive compounds (33).

For example, lycopene can be efficiently extracted from tomato peels, while other vegetable residues serve as rich sources of proteins, pigments, dietary fibers, carotenoids, and organic acids, offering significant potential for use in food, nutraceutical, and pharmaceutical applications (33). This method reduces waste accumulation and recovers nutritionally beneficial components for potential reuse (33). Furthermore, lemon seeds were found to possess a diverse flavonoid profile, containing notable levels of gallocatechin, caffeic acid, epicatechin, vitexin, quercetin, and hesperidin (40).

According to Ravichandran et al. (46), the peels of root vegetables, such as beetroot and carrot, are rich sources of bioactive polyphenols, including betagarin, betavulgarin, and cochliophilin A, as well as betalain pigments like betacyanin and betaxanthin. These compounds exhibit potent antioxidant activity, highlighting the nutritional potential of vegetable byproducts (46). According to Cartea et al. (47), cruciferous vegetables, especially broccoli and cauliflower, are rich in bioactive compounds such as dietary fiber, ascorbic acid, flavonoid derivatives (e.g., quercetin, kaempferol, and isorhamnetin), and phenolic acids (including p-coumaric, sinapic, and ferulic acids).

Additionally, studies have shown that lyophilized potato peel extracts demonstrate significant antioxidant activity in various in vitro assays (48). Research has shown that phenolic and flavonoid compounds in cucurbitaceae fruit peels effectively reduce lipid peroxidation, as reported by Rajasree et al. (45). Olive leaves contain valuable bioactive compounds, including rutin, tyrosol, hydroxytyrosol, and oleuropein, making them a rich source of beneficial metabolites (49). Similarly, analytical characterization in a recent study (50) demonstrated that olive leaves are a rich source of diverse phenolic compounds, including rutin, tyrosol, luteolin, quercetin, p-coumaric acid, ferulic acid, and caffeic acid (50). Figure 2 illustrates the bioactive compounds obtained from fruits and their corresponding functional properties.

Figure 2

Figure 2. Bioactive compounds derived from fruits and their associated functional properties.

4 Plant-based bioactive constituents

Plant-based functional foods are derived from natural or processed plant sources and contain known and unknown bioactive compounds (51). Functional foods can be systematically classified into six principal categories according to their dominant bioactive components: steroidal saponins, polyphenols, flavonoids, alkaloids, polysaccharides, and miscellaneous phytochemicals (52). Their elevated concentrations of bioactive constituents and demonstrated health-promoting properties have driven substantial growth in consumption patterns in recent years (53).

Representative examples encompass oats, citrus fruits (e.g., oranges), grapes, soybeans, garlic, flaxseed, tomatoes, tea, and cruciferous vegetables (e.g., broccoli). These functional foods play a vital role in promoting health, maintaining physiological homeostasis, and reducing the risk of diseases associated with phytochemical imbalances or deficiencies (54). Research on plant-based functional foods with immune-enhancing properties has gained considerable attention, driven by growing public awareness of their disease-preventive potential. As a result, an increasing number of individuals are incorporating these foods into their diets to strengthen immune function and support overall health (55). The populace has attained an enhanced quality of life through consuming vegetables, fruits, and other plant-based foods (56).

Figure 3 illustrates seeds as reservoirs of bioactive compounds that demonstrate a variety of biological activities, encompassing antioxidant, anti-inflammatory, antibacterial, and cardioprotective properties.

Figure 3

Figure 3. Seed bioactive components have antioxidants, anti-inflammatory, antibacterial, and cardioprotective characteristics.

4.1 Spices and condiments

Extensive phytochemical analyses have elucidated the bioactive metabolites present in culinary spices and condiments, particularly alkaloids, flavonoids, and tannins (57). A central objective within this research domain is the characterization of physiologically active constituents in functional foods. Notably, organosulfur compounds derived from garlic (Allium sativum) have emerged as key bioactive agents, with well-documented efficacy in lowering low-density lipoprotein (LDL) cholesterol, alleviating hypertension, and contributing to blood pressure regulation (58). Curcumin, the principal bioactive compound in turmeric (Curcuma longa), exhibits a wide range of biological activities, including antimicrobial, detoxifying, tonic, and antacid effects. Its mechanisms of action have been extensively characterized through studies involving protein expression profiling and molecular pathway analysis (59, 60).

Cuminaldehyde, the primary bioactive compound in cumin (Cuminum cyminum), exhibits a broad spectrum of physiological and therapeutic properties (61). These include lactogenic effects, enhancement of gastrointestinal function, stimulation of appetite, and modulation of taste perception. Clinically, it has been employed in the management of various conditions such as abdominal distension, fluid retention (edema), fever (pyrexia), gastrointestinal disturbances, including nausea, vomiting, and diarrhea, as well as anorexia and postnatal recovery (61, 62). Similarly, clove (Syzygium aromaticum) is rich in bioactive constituents, notably eugenol and eugenyl acetate, both of which exhibit potent natural antioxidant properties (63, 64).

Similarly, black pepper (Piper nigrum) yields piperine, a bioactive alkaloid with established anti-inflammatory, antioxidant, and chemopreventive properties. Nutmeg (Myristica fragrans) contains abundant antioxidant compounds, including flavonoid derivatives, terpenoids, and hydrolyzable tannins (65). Fenugreek (Trigonella foenum-graecum) contains valuable phytochemicals, including vitexin, kaempferol, and quercetin, which exhibit analgesic and antidiabetic effects. Zhang et al. (66) employed a series of in vitro bioassays to evaluate the functional food potential of coriander (Coriandrum sativum) seeds. Their study not only confirmed the nutraceutical value of the seeds but also pioneered a comprehensive phytochemical characterization of roasted coriander specimens. The findings substantiate the classification of roasted coriander as a functional food, supported by systematic bioactivity profiling.

4.2 Medicinal plants

These kinds of plants are widely acknowledged for their significant pharmacological potential and long-standing role in traditional and modern therapeutic practices worldwide (67). They exhibit potent antimicrobial activity against pathogenic bacteria, glucose-lowering effects in diabetes management, and clinically significant anti-hyperglycemic and anti-hyperlipidemic properties (67). These botanicals are primarily utilized in preventive healthcare, targeting a broad spectrum of conditions ranging from common infections to chronic diseases, such as cancer. Unlike staple dietary components, their use is typically focused on therapeutic or functional purposes rather than routine nutritional intake (68).

Different plant organs, including stems, roots, leaves, flowers, bark, and fruits, contain abundant bioactive compounds such as phenolic acids (rosmarinic, caffeic, carnosic), flavonoids (quercetin, kaempferol, and luteolin glycosides), terpenoids (oleanolic acid and triterpenoids), and specialized metabolites (anthraquinones, alkaloids, emodin, and eugenol), which have been validated as effective nutraceutical additives (69). Furthermore, plant-derived extracts offer substantial potential for promoting sustainable food production systems, while enhancing ecological and socioeconomic benefits through their application in functional food development (70). Despite these advances, additional research is required to investigate: (1) human sensory perception, (2) novel sources of antimicrobial and antioxidant compounds, (3) optimal extraction parameters, and (4) fundamental mechanisms governing food preservation (71). Rosemary (Rosmarinus officinalis) extracts demonstrate versatile applications across multiple domains, including plant-based nutrition, pharmaceutical formulations, functional foods, and natural food preservation systems (72).

As an abundant, economical, and safe botanical resource, rosemary facilitates the commercial adoption of its essential oils and phenolic-rich extracts within the food industry (73, 74). Rosemary (R. officinalis) has demonstrated significant antimicrobial activity in various meat products, including cooked beef (75), sausage (76, 77), and beef meatballs (78, 79). Although medicinal plants exhibit well-documented antimicrobial and antioxidant properties with proven health benefits, their use as natural food preservatives remains relatively underexplored compared to other botanically derived sources, such as fruits, vegetables, herbs, and spices, which share similar phytochemical profiles (80). Research indicates that the functional properties of plant materials are attributed mainly to their bioactive constituents, particularly terpenes and phenolic compounds, which play key roles in antioxidant, antimicrobial, and anti-inflammatory activities (81, 82).

4.3 Fruits

They are universally acknowledged as prototypical functional foods, owing to their abundant concentrations of bioactive constituents, notably soluble dietary fiber, antioxidant phytochemicals, essential minerals, and vitamins (particularly ascorbic acid, retinol equivalents, and tocopherols) (83). The polyphenolic composition of fruits predominantly comprises two principal classes: (i) non-flavonoid derivatives, including lignans, hydroxycinnamic/phenolic acids, and stilbenes and (ii) flavonoid subclasses, encompassing flavones, flavonols, flavanones, isoflavones, and anthocyanin pigments (84, 85).

Several countries, including the United States, Poland, and New Zealand, have successfully commercialized fruit-based functional beverages, capitalizing on the natural health benefits, sensory appeal, and perceived freshness of their botanical ingredients. These products incorporate a diverse array of fruit varieties, spanning pomaceous fruits (apples), stone fruits (mangoes, peaches, plums, and cherries), berries (blueberries, strawberries, blackcurrants, and cranberries), tropical species (açaí, acerola, kiwifruit, and guarana), and vine crops (grapes and pomegranates) (86, 87). Mango (Mangifera indica), often referred to as the “king of fruits,” contains a rich and diverse profile of polyphenolic compounds distributed throughout its various anatomical parts, including the seed, bark, pulp, leaves, peel, and floral tissues, each contributing to its bioactive potential (88). Notably, the xanthonoid mangiferin exhibits exceptional antioxidant capacity and broad-spectrum therapeutic potential. Litchi (Litchi chinensis) similarly qualifies as a functional food, with established anti-neoplastic activity demonstrated through both in vitro and in vivo investigations (89, 90). Meanwhile, globally cultivated peanuts (Arachis hypogaea) serve as nutrient-dense ingredients in processed foods, containing essential vitamins, proteins, dietary fiber, and bioactive phytochemicals (91), including phenolic acids, flavonoids, resveratrol, and phytosterols, compounds that have been clinically shown to inhibit intestinal cholesterol absorption (92, 93).

Jujube (Ziziphus jujuba) fruit is widely consumed worldwide as both a traditional food and a functional ingredient. It can be eaten fresh as pulp or processed into various food products, including beverages, pickles, compotes, jams, and jellies (94). Additionally, the dried pulp is a versatile functional ingredient in the food industry, incorporated into baked goods (bread, cakes), snacks, Chinese dates, and tea blends. According to Cai et al. (94), Ziziphus mauritiana (Indian jujube) fruit juice is rich in phenolic compounds and essential nutrients, underscoring its strong potential as a functional food ingredient. Deng et al. (95) investigated the health benefits of soluble dietary fiber derived from Rhodomyrtus tomentosa fruits, highlighting its potential as a functional food component. Their findings suggest that this dietary fiber may inhibit the accumulation of advanced glycation end-products (AGEs) in the body, thereby exerting protective effects against AGE-associated diseases, such as diabetes, cardiovascular disorders, and neurodegenerative conditions (95).

4.4 Cereals

Cereals provide 60%−70% of the global daily energy intake and are consumed in whole, processed products, and fully refined derivatives (96). Certain varieties, such as colored rice, maize, wheat, and specific millets, are abundant in bioactive compounds like polyphenols, tocopherols, and antioxidants (97). These functional components play a crucial role in regulating and preventing chronic diseases, including cardiovascular disorders, hypertension, and type 2 diabetes. Furthermore, whole grain cereals have been associated with reduced cancer risk, improved blood pressure regulation, and enhanced glycemic control, contributing to overall chronic disease prevention (98).

Cereals and their derivatives are gaining recognition as functional foods because they provide vital nutrients, including vitamins, minerals, energy-yielding compounds, antioxidants, and dietary fiber (99). Prominent dietary fibers such as β-glucan and arabinoxylan exhibit significant health benefits. As a soluble fiber, β-glucan enhances fluid viscosity, potentially promoting small intestinal fermentation, delaying gastric emptying, slowing intestinal transit, and increasing luminal viscosity (100, 101). Additionally, cereals serve as an optimal fermentable substrate for probiotic bacteria, fostering their proliferation and metabolic activity (102, 103).

These grains are also rich in bioactive compounds, including vitamin E, linoleic acid, dietary fiber, selenium, folate, and phenolic acids, which confer antioxidant properties and may reduce the risk of coronary heart disease (98, 104). Certain cereal-based functional foods not only enhance dietary nutrition but also offer weaning benefits, along with probiotic and prebiotic advantages (97). According to Bora et al. (105), millets are particularly notable for their hypoglycemic effects and dense nutritional profile, positioning them as promising candidates for the development of functional foods (105).

4.5 Vegetables

Vegetables are a cornerstone of a balanced diet, providing essential macronutrients and micronutrients, including vitamins, minerals, and dietary fiber, that are critical for maintaining optimal health and preventing nutrient-related disorders (106). Due to their seasonal nature, market demands, and consumer preferences, most vegetables undergo processing, resulting in significant byproducts (107).

As an essential component of a balanced diet, vegetables are rich in diverse bioactive compounds, including polyphenols, glucosinolates, and carotenoids, which have been extensively associated with the prevention and risk reduction of chronic diseases such as cardiovascular disorders, type 2 diabetes, and various forms of cancer (108). Vegetable processing byproducts are a rich source of valuable nutrients, encompassing lipids, proteins, carbohydrates, fiber, essential oils, and bioactive compounds such as flavonoids and phenolics (109). These bioactive constituents frequently exhibit therapeutic properties, such as antibacterial, anti-inflammatory, and antioxidant activities, rendering them potentially effective in the prevention and management of gut-related disorders, including dysbiosis and immune-mediated inflammatory conditions (110). Certain fruits like tomatoes—commonly classified as vegetables in culinary use—contain lycopene as their primary pigment. This compound has shown significant anticancer effects and ranks among the most potent biological antioxidants (111, 112). Similarly, studies on okra (Abelmoschus esculentus) have identified beneficial compounds like flavonoids and catechins, which contribute to various health benefits, including anticancer, antidiabetic, antimicrobial, and antihypertensive effects (113). Given their potential health advantages, okra and its derivatives are increasingly used as key ingredients in innovative functional foods (114).

Research on plant-based fermented foods is rapidly expanding, driven by the probiotic potential of their native microbial communities, their versatility across food and pharmaceutical industries, and their growing significance as non-dairy carriers for probiotic delivery, particularly appealing to lactose-intolerant, vegan, and health-conscious consumers (115). Unlike dairy-based options, plant-derived fermentations are suitable for lactose-intolerant individuals, those with milk allergies, or consumers following vegan diets (116). These products are particularly appealing because they provide essential nutrients, including vitamins, minerals, antioxidants, and fibers, while typically containing low sugar levels. Additionally, they may act as novel carriers for traditional dairy probiotics, offering opportunities to expand into new consumer markets (117).

5 Functional foods of plant origin rich in bioactive compounds

Plant bioactive compounds are typically distinguished from essential nutrients, as they are classified as secondary metabolites, non-essential for basic growth and development but crucial for plant defense and ecological interactions, and increasingly recognized for their health-promoting effects in humans (118). However, these compounds play vital ecological roles in plant defense, competition, reproduction, and signaling (119). They are often defined as plant-derived secondary metabolites that exert pharmacological or toxicological effects in humans and animals (118, 120–122).

Figures 4, 5 illustrate the primary and secondary metabolites in plant-based foods, encompassing spices, sauces, medicinal herbs, cereals, and vegetables, which substantially augment their nutritional profile. These phytochemicals encompass various chemical classes, including polysaccharides, saponins, flavonoids, alkaloids, vitamins, carotenoids, fatty acids, polyphenolic compounds, essential oils, phytosterols, and cannabinoids. Each class demonstrates unique biological activity, capable of inducing specific cellular and physiological responses that confer health benefits.

Figure 4

Figure 4. Representative chemical structures of bioactive secondary metabolites derived from medicinal plants, thoroughly categorized based on their biosynthetic origins. The major classes include: (1) phenolic compounds, such as salvianolic acids (Salvia miltiorrhiza), xanthohumol (Humulus lupulus), scutellarin (Erigeron breviscapus), and baicalein (Scutellaria baicalensis); (2) terpenoids, including ginsenosides (Panax ginseng), cucurbitacin IIa (Hemsleya chinensis), artemisinin (Artemisia annua), and mogroside V (Siraitia grosvenorii); and (3) alkaloids, such as vincristine (Catharanthus roseus), morphine (Papaver somniferum), vincamine (Vinca minor), berberine (Berberis vulgaris), and paclitaxel (Taxus wallichiana).

Figure 5

Figure 5. Classification of bioactive plant chemicals according to their chemical structure and biological function, encompassing polyphenols, alkaloids, terpenoids, glycosides, and organosulfur compounds.

5.1 Polysaccharides

Plant polysaccharides are extensive polymers composed of many similar or varied monosaccharides interconnected via α- or β-glycosidic bonds (123). Plants synthesize a wide variety of polysaccharides, including starch, cellulose, and pectin, which exhibit substantial structural diversity in terms of molecular composition, configuration, and molecular weight across different species. This structural variability underlies their widespread distribution throughout the plant kingdom and contributes to their distinct functional roles in both plant physiology and food systems (124).

Polysaccharides include numerous bioactive compounds found in various plant-derived functional foods. Complex carbohydrates are crucial for sustaining human health and are associated with multiple health benefits (125). Extensive research has been dedicated to the extraction and characterization of polysaccharides, a significant class of biomacromolecules, due to their diverse bioactive properties and wide-ranging applications in food, pharmaceutical, and biomedical fields. Naturally derived polysaccharides are generally low in toxicity while exhibiting diverse biological activities, including antibacterial and anti-inflammatory properties (126–128). Plant polysaccharides serve as energy reserves by undergoing hydrolysis, which releases sugars that are utilized in metabolic pathways. These compounds also act as nutritional reservoirs during periods of fasting (129). Among these, starch and glycogen are recognized as the most prominent storage polysaccharides in biological systems (130).

Structural polysaccharides are complex carbohydrates that provide vital mechanical support to various biological systems (131). They help maintain structural stability within the cellular membranes of plants and animals. The two primary forms are cellulose and chitin (132). Mucopolysaccharides (also called mucilage polysaccharides) are naturally occurring compounds present in plant cell walls, cyanobacteria, and intercellular cementing substances (133). Structurally, polysaccharides are composed of various monosaccharide units and sugar derivatives, including galactose and uronic acids, which contribute to their functional diversity and bioactivity (134). A particularly important mucopolysaccharide is pectin, which is predominantly located in the cell walls and intercellular layers of fruits. Citrus peels serve as a rich source, containing 0.5%-3.5% pectin, making them valuable for jelly and jam production (135).

Chemically, pectin is composed of galactose, arabinose, galacturonic acid, and dimethyl galacturonic acid (132). Medicinal plants serve as essential sources of bioactive polysaccharides with diverse therapeutic applications (136). Key examples include Mactra veneriformis, Acacia tortilis, various Dendrobium species, Saccharina japonica, Acanthopanax senticosus, Prunus persica, and Aloe barbadensis (134). Non-starch polysaccharides support cardiovascular health by promoting the conversion of cholesterol into bile acids, a process that aids in lowering serum cholesterol levels and may subsequently reduce the risk of acute cardiovascular events (137). Additionally, polysaccharide digestion plays a crucial role in regulating blood glucose and insulin levels (138, 139).

The term “glycemic index” typically measures how quickly available carbohydrates raise blood glucose levels compared to a reference carbohydrate, such as pure glucose (140). In recent years, polysaccharides have emerged as highly promising biomaterials in biomedical applications due to their biocompatibility, versatile physicochemical properties, and biodegradability (141). An expanding body of research indicates that dietary fiber and resistant polysaccharides play a significant role in mitigating risk factors associated with chronic diseases, including cardiovascular disorders and certain types of cancer. These insights present a compelling opportunity for researchers in agricultural and food sciences to develop innovative functional food products that address the growing global burden of diet-related health conditions (142).

5.2 Saponins

An expanding body of research indicates that dietary fiber and resistant polysaccharides play a significant role in mitigating risk factors associated with chronic diseases, including cardiovascular disorders and certain types of cancer (143). These insights offer a compelling opportunity for researchers in agricultural and food sciences to develop innovative functional food products aimed at addressing the growing global burden of diet-related health conditions (143). Their applications are broad, ranging from natural food additives to traditional medicine and pharmaceutical uses (144). Saponins exhibit notable therapeutic properties, including cholesterol reduction, blood glucose regulation, asthma relief, antioxidant effects, antihypertensive activity, and antimicrobial action. However, their potential cytotoxicity and other adverse effects must also be considered (143).

The rising demand for saponins has driven increased research into both natural and synthetic production methods to meet market and industrial needs. Processing techniques play a critical role in determining the content and bioavailability of saponins, as they influence the structural integrity and interaction between the aglycone core and attached sugar moieties, which in turn affect their functional and therapeutic properties (145). Studies highlight the therapeutic value of specific saponins, such as platycosides from balloon flower (Platycodon grandiflorus), which are widely incorporated into dietary supplements and show promising efficacy in respiratory health management (146).

Research has identified Bacopa monnieri (Brahmi) as a saponin-rich medicinal plant used in culinary applications. When incorporated into curry preparations, saponin-containing ingredients can help reduce bitterness while enhancing the overall flavor profile, contributing to improved palatability and sensory appeal (147). Another study demonstrated that daucosterol, a bioactive compound isolated from Eleocharis dulcis (water chestnut) peels, exhibits anti-hyperglycemic properties, suggesting its potential as a functional dietary supplement (148). The intensified research focus on saponins is primarily driven by their extensively characterized bioactivities and their widespread presence in commonly consumed dietary sources, including tea, cereals, legumes, and medicinal botanicals. Owing to their natural abundance and diverse pharmacological properties, saponins have become the subject of considerable scientific investigation aimed at elucidating their therapeutic potential and underlying biochemical mechanisms (143).

5.3 Flavonoids

Flavonoids are diverse polyphenolic plant compounds, categorized into several subclasses, each with distinct dietary sources. For example, flavonols are abundant in foods such as broccoli, onions, tea, and a variety of fruits (149), while flavones are commonly found in chamomile, tea, parsley, and celery (150). Flavanones occur predominantly in citrus fruits (151), whereas flavanols are richly present in apples, cocoa, grapes, tea, and red wine (152). Anthocyanidins are highly concentrated in red wine and berries (153), and isoflavones are primarily derived from soy-based products (154). Their structural variations determine their ability to influence different metabolic pathways (155).

After ingestion, the bioavailability, distribution, and formation of bioactive flavonoid metabolites are determined by differences in absorption, metabolism, administration, and excretion (156, 157). Soy isoflavones, flavonols, and flavones are among the most prevalent dietary flavonoids. Their concentrations in foods vary depending on environmental conditions (e.g., sunlight exposure, ripeness), genetic factors (e.g., plant variety), and postharvest processing techniques (158). As natural phenolic antioxidants, flavonoids play a critical role in human nutrition by mitigating oxidative stress and contributing to disease prevention. Dietary sources such as leafy greens, olives, fruits, red wine, soybean oil, tea, and dark chocolate provide substantial health benefits attributed mainly to their high flavonoid content and associated antioxidant activity (159). Beyond this, some flavonoids exhibit additional biological effects, including antiallergic, antiviral, anti-inflammatory, and anticancer properties, while also influencing metabolic pathways in mammals (160, 161).

Extensive scientific evidence, from both in vitro studies and clinical trials, consistently demonstrates that flavonoid-rich foods such as cocoa, tea, and berries exert beneficial effects on cardiovascular health and metabolic function, including improvements in endothelial function, lipid profiles, and insulin sensitivity (162). Notably, cocoa flavonoids have a modest but measurable impact on key physiological markers, including blood pressure, insulin sensitivity, endothelial function, and lipid profiles (157, 163).

These compounds exert anti-inflammatory effects through multiple molecular pathways, including the inhibition of key enzymes such as cyclooxygenase (COX) and lipoxygenase, as well as the suppression of pro-inflammatory transcription factors like nuclear factor-kappa B (NF-κB), thereby reducing the synthesis of inflammatory mediators (164). Furthermore, as powerful antioxidants, flavonoids neutralize free radicals and prevent their generation. They also play a crucial role in regulating immune cells and inflammatory signaling pathways (161, 165). Multiple studies have demonstrated that flavonoids possess potent antioxidant and anti-inflammatory properties, as well as notable anticancer effects mediated through mechanisms such as free radical scavenging, modulation of cell signaling pathways, and induction of apoptosis in malignant cells (164). Furthermore, flavonoids have been shown to exhibit antiviral and antimicrobial activities, which may contribute to their protective effects against infections and indirectly support the prevention of coronary heart disease by reducing systemic inflammation and pathogen-induced vascular damage (164).

Ongoing and future research will undoubtedly advance our understanding of the critical roles flavonoids play in both nutritional health and therapeutic applications, reinforcing their significance as bioactive constituents in functional foods and pharmacological formulations (165). There is a need to develop a suitable model capable of comprehensively analyzing flavonoid extraction, characterization, bioavailability, and administration (165).

5.4 Alkaloids

Alkaloids are nitrogen-containing compounds naturally occurring in various plant and animal species (166, 167). Due to their complex structures and potent physiological effects, these compounds warrant thorough investigation for their potential role in reducing uric acid levels. Recent studies suggest that alkaloids can inhibit xanthine oxidase and adenosine deaminase activity while promoting uric acid excretion and suppressing its reabsorption (168).

Alkaloids, a diverse class of nitrogen-containing secondary metabolites, are categorized into various pharmacological groups and exhibit a wide range of bioactivities, including astringent, adrenergic, toxic, antibiotic, diuretic, stimulant, anti-inflammatory, antihypertensive, antimycotic, analgesic, antigout, expectorant, emetic, and antispasmodic effects (168). In addition, dietary alkaloids hold substantial significance across multiple disciplines, including organic chemistry, food technology, nutraceutical innovation, and pharmaceutical development, due to their diverse bioactivities and structural complexity (168).

Medicinal alkaloids, when ingested in large quantities, have been linked to the onset of several diseases, including cancer and cardiovascular issues (169). The degree of dependence fluctuates according to the individual types of alkaloids and their associated concentrations. Alkaloids are broadly classified into six major categories, with each family exhibiting distinct physicochemical and pharmacological properties derived from its unique chemical structure (170, 171).

Alkaloids exhibit beneficial properties for human health; however, certain compounds, such as cocaine, can have severe adverse effects, including dental enamel erosion and caries formation (172). Excessive caffeine intake has been associated with an increased risk of certain cancers and adverse pregnancy outcomes, including spontaneous abortion, according to epidemiological and clinical studies. Due to these potential risks, alkaloid-containing foods are regulated, as these naturally occurring nitrogenous compounds are present in many dietary sources (173).

5.5 Vitamins

Vitamins are essential for cellular function, growth, and development (174). They are broadly classified into two groups: fat-soluble (A, D, E, and K) and water-soluble (B-complex and C) vitamins (155). Fat-soluble vitamins are stored in the liver, adipose tissue, and skeletal muscles. In contrast, water-soluble vitamins (except vitamin B12) are not retained in the body and are primarily excreted through urine (175).

Maintaining a balanced diet is essential for sustaining adequate vitamin levels. Research has shown that the oral bioavailability of biotin is relatively low in both humans and animals, highlighting the need for optimized dietary intake and, in some cases, supplementation (176, 177). Vitamin E (DL-α-tocopherol), known as tocopherol, occurs naturally in high concentrations in chlorophyll-containing plant tissues and grass seed embryos. While natural sources are abundant, most commercial vitamin E products consist of its synthetic form, the most extensively studied variant of fat-soluble vitamin E (178). Owing to its well-documented health benefits, tocopherol, along with other antioxidant compounds, is widely utilized across various industries, including pharmaceuticals, cosmetics, and food and animal feed production, where it serves both functional and preservative roles (179).

Current research on bioactive compounds in functional foods is limited in scope and depth, underscoring the need for more comprehensive and interdisciplinary studies to elucidate their health-promoting processes and potential applications thoroughly (180). More thorough analysis and characterization of these functional components could substantially advance the development of next-generation functional food products (180).

Recent advances in biotechnology have significantly enhanced the efficiency of extracting and isolating bioactive compounds, thereby accelerating the diversification of functional ingredients available for use in food, pharmaceutical, and nutraceutical applications. For the natural vitamin E industry, three particularly promising research directions have emerged: (1) process optimization for natural vitamin E extraction, (2) methylation approaches for non-α-tocopherol derivatives, and (3) creation of enhanced downstream applications to increase product value (180).

5.6 Carotenoids

Carotenoids represent a diverse group of lipid-soluble pigments widely distributed in plants, playing a crucial role in photoprotection (181). These hydrocarbon compounds contain at least 40 carbon atoms with conjugated double bond systems, existing in both oxygenated and non-oxygenated forms. Epidemiological studies have consistently associated carotenoid-rich diets with a decreased risk of various cancers, likely due to the antioxidant, anti-inflammatory, and immune-modulating properties of these compounds (182, 183). Among these compounds, lutein emerges as the predominant polar carotenoid, contrasting with non-polar counterparts such as lycopene, α-carotene, and β-carotene (184, 185).

As a xanthophyll, lutein typically co-occurs with zeaxanthin, with commercial lutein extracts (derived from Tagetes erecta) containing approximately 90% lutein and 5% zeaxanthin. Fruit and vegetable carotenoid concentrations vary significantly depending on storage conditions and ripening stage (186). Notably, lycopene exhibits vigorous chemopreventive activity, primarily through its ability to scavenge reactive oxygen species (ROS), thereby mitigating oxidative stress and reducing DNA damage associated with carcinogenesis.

The global carotenoid market encompasses numerous variants, including lutein, β-carotene, astaxanthin, and lycopene (187). While most staple crops naturally contain limited carotenoid concentrations (186), biotechnological advances have significantly enhanced carotenoid levels in food crops (188). These improvements have been achieved by strategically manipulating carotenoid biosynthetic pathways, targeted gene expression modifications, and microbial fermentation techniques (189).

5.7 Fatty acids

Fatty acids constitute an essential category of lipid molecules found throughout biological systems, where they serve crucial functions in numerous physiological processes (190). Structurally, they are categorized into two primary types: saturated fatty acids (SFAs) and unsaturated fatty acids—the latter comprising both monounsaturated (MUFAs) and polyunsaturated (PUFAs) subclasses (191, 192).

SFAs consist of straight hydrocarbon chains without double bonds, typically ranging from 14 to 24 carbon atoms in length. In contrast, PUFAs have shorter chains (16–22 carbons) and contain 2–6 double bonds (193). A distinct subgroup, highly unsaturated fatty acids (HUFAs), is defined by longer chains (≥20 carbons) with three or more double bonds (194, 195). Fatty acids are further classified as medium-chain (MCFA) or long-chain (LCFA) based on their carbon length.

Research by Ramírez et al. (196) indicates that MCFAs are absorbed more efficiently across the intestinal mucosa than LCFAs, due to their shorter carbon chain length and greater solubility. In contrast to saturated fats, unsaturated fats remain liquid at room temperature and are associated with a range of health benefits, including improved lipid profiles and reduced cardiovascular risk (196).

MUFAs are found in olive oil, avocados, nuts (pecans and almonds), peanut oil, canola oil, and pumpkin seeds (197). PUFAs are abundantly found in dietary sources such as sunflower oil, corn, flaxseeds, walnuts, and seafood. Ongoing exploration of emerging technologies, underlying biological mechanisms, and novel applications may further enhance scientific understanding and optimize the health-promoting potential of these essential fatty acids (198).

5.8 Polyphenolic components

Phenolic compounds are widely recognized as potent natural antioxidants (199, 200); however, their bioavailability is highly influenced by structural characteristics, such as molecular weight, glycosylation, and degree of polymerization, as well as the complexity of the food matrix and interactions with other dietary components. Phenolic compounds are widely recognized as potent natural antioxidants (152). However, their bioavailability is highly influenced by structural characteristics, such as molecular weight, glycosylation, and degree of polymerization, as well as the complexity of the food matrix and interactions with other dietary components (152).

In plants, leaves function as the primary interface for defense against ultraviolet radiation and pathogenic invasion, while simultaneously playing essential roles in photosynthesis, growth regulation, reproductive development, and pigmentation (201, 202). The antioxidant capacity of phenolic compounds is primarily determined by their molecular structure, particularly the presence of a benzene ring and the number and positioning of hydroxyl (OH) groups. The benzene ring enhances stability by enabling interactions with free radicals (203). A notable example is gallic acid, a phenolic acid featuring three hydroxyl groups and one carboxylic acid group (204). These hydroxyl groups allow gallic acid to act as an antioxidant by generating free radicals that counteract oxidative damage (205).

Plant-derived phenolic extracts have gained considerable attention as effective natural alternatives to synthetic antioxidants for inhibiting lipid oxidation in food systems, thereby enhancing shelf life and preserving nutritional and sensory qualities (206). Research indicates that phenolic compounds obtained from various botanical sources, including agricultural byproducts like peels, stems, and seeds, often perform comparably or surpass traditional antioxidants such as ascorbic acid and tocopherols (201, 207). Emerging evidence indicates that purified phenolic compounds effectively mitigate oxidative degradation and color deterioration in bulk oils, meat products, and lipid-based emulsions by scavenging free radicals and chelating pro-oxidant metal ions. Moreover, these plant-based extracts show promising applications as functional dietary antioxidants (208, 209).

Phenolic compounds represent a significant group of antioxidants acting as free radical scavengers. These compounds effectively suppress lipid oxidation by preventing the initiation phase or interrupting the propagation phase of oxidative chain reactions. Through this mechanism, they minimize the formation of volatile degradation products, particularly ketones and aldehydes, that contribute to food rancidity (210, 211). Nevertheless, as the commercial application of polyphenol-based nanoparticles continues to expand, comprehensive safety assessments must be prioritized throughout their development. Regulatory authorities should establish and enforce standardized evaluation protocols to ensure rigorous safety validation before approving products for consumer use (211).

5.9 Essential oils

Essential oils are complex mixtures of volatile, low-molecular-weight compounds, primarily composed of monoterpenes and sesquiterpenes (212). However, they may also contain important non-terpenoid components such as phenylpropanoids and sulfur- and nitrogen-containing compounds (213, 214). These oils play vital roles in plant ecophysiology, contributing to defense mechanisms, environmental adaptation, and pollination. Furthermore, significant advancements have been made in harnessing these compounds for various practical applications (213).

The food industry has effectively incorporated various essential oils approved as safe for human consumption (215). These oils hold Generally Recognized as Safe (GRAS) status from the U.S. Food and Drug Administration (FDA), while the European Commission has similarly authorized specific essential oil components as approved flavoring agents (216, 217). In addition to their flavoring properties, essential oils contribute substantially to food preservation. Their antimicrobial and antioxidant characteristics enable diverse applications, including active food packaging systems that suppress microbial growth and prolong product shelf life (218). Despite existing implementation challenges, essential oils contribute to sustainable food production and align with clean-label initiatives, positioning them as increasingly valuable functional ingredients in contemporary food processing (219).

5.10 Phytosterols

Plant sterols (phytosterols and stanols) are bioactive plant compounds recognized for their cholesterol-lowering properties in humans (220). Due to their structural similarity to cholesterol, phytosterols competitively inhibit its absorption in the intestinal lumen, enhancing fecal excretion and subsequently lowering circulating plasma cholesterol levels (221, 222).

While naturally present in unrefined vegetable oils (e.g., olive, sesame, and nut oils), nuts (such as pistachios and macadamias), herbs (such as thyme, oregano, and sage), and other plant foods (223), their endogenous concentrations typically exert limited physiological effects. However, when concentrated and incorporated into functional foods, such as fortified spreads, dairy products, or dressings, phytosterols demonstrate clinically meaningful efficacy in cholesterol management (224).

5.11 Cannabinoids

Cannabis is a comprehensive category representing an annual herbaceous plant belonging to the Cannabaceae family (225). The primary species recognized within the genus Cannabis include Cannabis sativa, Cannabis indica, and, though still subject to taxonomic debate, Cannabis ruderalis (226). C. sativa produces a diverse array of non-nutritive phytocannabinoids, bioactive compounds that include the well-characterized delta-9-tetrahydrocannabinol (THC) and cannabidiol (CBD) as its most prominent representatives (227). To date, researchers have identified approximately 110 distinct cannabinoids within the Cannabis species, each exhibiting unique chemical structures and pharmacological profiles. These specialized metabolites are predominantly biosynthesized and stored in glandular trichomes–secretory structures found on flowering plants, liverworts, and certain fungi (228).

Hemp plants contain numerous non-psychoactive cannabinoids, such as cannabichromene, cannabigerol, and cannabidiol (CBD), as well as a wide range of non-cannabinoid constituents belonging to various classes of naturally occurring phytochemicals, including terpenes, flavonoids, and phenolic compounds (229). Emerging research suggests that specific cannabinoids demonstrate therapeutic potential for managing diverse medical conditions, particularly chronic pain, anxiety disorders, and cachexia (228). These compounds may also serve as appetite stimulants and possess anti-nausea effects (230). In low-THC hemp varieties, fundamental metabolic pathways generate primary metabolites (amino acids, fatty acids, and steroids) that serve as precursors for secondary metabolites. These include terpenoids, flavonoids, alkaloids, lignans, and the distinctive C21 terpenophenolic compounds known as phytocannabinoids (231).

The psychoactive THC originates from the decarboxylation of its acidic precursor THCA, while non-psychoactive CBD forms through analogous decarboxylation of CBDA (227). The contemporary market offers a wide array of products containing cannabis extracts; however, this growing availability also heightens the potential for adverse effects among consumers. A significant proportion of cannabis-infused edibles lack adequate regulatory oversight, posing a notable risk of accidental ingestion, particularly among vulnerable populations such as children (232).

The incidence of such cases has increased in regions where cannabis has been legalized or decriminalized. While most cannabis-infused edibles have not yet received FDA approval, ongoing research is assessing their long-term safety and potential cumulative health effects (233). Updating cannabis regulations requires the implementation of stringent safety measures to mitigate the risk of pediatric cannabis toxicity and prevent unintentional overdoses, particularly in the context of edible and easily accessible cannabis-infused products. Additionally, understanding industry standards and consumer practices—particularly concerning the proper preparation and packaging of cannabis edibles—is crucial to ensuring both safety and an optimal consumption experience (234).

6 Traditional and modern extraction techniques of bioactive compounds from plants

The solubility of active compounds is influenced by other solutes, various molecules in the plant matrix, and the solvent employed for solubilization, all of which affect extraction (235). Prior to extraction, plant tissue must be thoroughly homogenized to disrupt cellular structures and enhance the efficiency and yield of bioactive compound recovery (236).

Bioactive natural chemicals are consistently present in plant matrices and are often found in limited quantities in natural sources (237, 238). All components of the plant, including leaves, roots, barks, tubers, wood, gums or oleoresins, exudates, fruits, figs, flowers, rhizomes, berries, and twigs, produce active chemicals in varying quantities and concentrations. To maximize tissue extract yield, selecting the optimal extraction procedure is crucial (239).

The extraction efficiency depends on several key factors, including processing methods, plant matrix properties, solvent selection, and operational parameters, such as temperature, pressure, and duration. As a critical step in herbal product manufacturing, the extraction process profoundly influences both the qualitative composition and quantitative yield of bioactive compounds (240).

Given the vast taxonomic diversity of plant species and the complexity of their phytochemical profiles, a systematic and high-throughput screening approach is essential for the efficient identification and evaluation of bioactive constituents (240). Following efficient extraction, downstream processes such as separation, identification, and structural characterization of bioactive compounds can be carried out systematically and effectively. Multiple variables affect bioactive compound recovery, with critical considerations including solvent choice, starting material quality, and the selection of extraction techniques (241).

Efficiently isolating bioactive compounds from natural sources necessitates strategically implementing optimized extraction methodologies. Contemporary research has increasingly focused on the extraction, characterization, and application of phenolic compounds from plant matrices due to their significant bioactive potential (242). To maximize the recovery of these valuable phytochemicals, an integrated extraction strategy combining multiple complementary techniques has proven more effective than relying on a single method, as it enhances yield, selectivity, and preservation of compound integrity (242).

Recent decades have witnessed significant advancements in extraction technologies, marked by improved environmental sustainability, reduced reliance on synthetic chemicals, shorter processing times, and enhanced extract quality (243). These modern extraction techniques are gaining prominence for improving both the yield and selectivity of bioactive plant compounds (36). Environmentally conscious methods that minimize energy consumption and organic solvent use have been formally recognized as “green technologies” (244). The food industry has enhanced its processing capabilities through advanced extraction technologies, particularly ultrasound-assisted, pulsed electric field, enzymatic, microwave, supercritical fluid, and pressurized liquid extraction (PLE) systems (245).

Researchers have proposed innovative extraction strategies to overcome the constraints of conventional extraction approaches. The food industry has demonstrated growing interest in advanced extraction technologies such as pressurized liquid extraction (PLE), UAE, MAE, subcritical water extraction (SWE), supercritical fluid extraction (SFE), enzyme-assisted extraction (EAE), and PEFE, due to their enhanced efficiency, reduced solvent usage, and ability to preserve thermolabile bioactive compounds (246). Academic research indicates that integrating modern extraction techniques provides a highly effective strategy for achieving both rapid processing and enhanced extraction efficiency, while preserving the structural integrity and bioactivity of target phytochemicals (246). A substantial body of evidence demonstrates that advanced extraction technologies markedly enhance process efficiency and improve the quality, purity, and stability of extracted bioactive compounds (246).

Table 2 presents a comparative study of conventional and current extraction processes, including their advantages, disadvantages, and limitations. Figure 6 depicts the various extraction methods (both traditional and innovative) and the biological activity of the extracted bioactive compounds.

Table 2

Table 2. Comparative assessment of the effectiveness, limitations, and applications of conventional and novel extraction techniques.

Figure 6

Figure 6. Various extraction techniques (both conventional and innovative) and the biological properties of the extracted bioactive substances.

6.1 Conventional extraction techniques

Conventional extraction techniques remain the gold standard for isolating bioactive compounds from solid food matrices (Tables 1, 2). The most widely employed methods are Soxhlet extraction, heated reflux extraction, and maceration. Soxhlet extraction carries special historical importance, initially developed in 1879 by German chemist Franz Ritter von Soxhlet for lipid extraction (247). The Soxhlet method remains a crucial benchmark for evaluating the performance of modern extraction technologies. In their study, Kodal and Aksu (248) utilized Soxhlet extraction to isolate carotenoid pigments from orange peel. Their results demonstrated optimal carotenoid recovery (4.5 mg carotene/g dry peel) when processing frozen peel material at 79°C using ethanol with a 40:1 liquid-to-solid ratio. However, the researchers noted that the extracted compounds were susceptible to lipid oxidation degradation, resulting in the breakdown into terpene monomers (248).

Similarly, Caldas et al. (249) successfully isolated phenolic compounds—particularly catechin, rutin, and epicatechin—from grape peel using Soxhlet extraction. The heat reflux extraction method, which employs specialized apparatus, substantially enhances extraction efficiency by improving mass transfer between the solvent and solute at elevated temperatures (249). This technique operates by continuously cycling heated solvent vapors through the sample matrix under tightly regulated condensation conditions, thereby facilitating efficient solubilization and extraction of target compounds (250).

Although these extraction techniques are cost-effective and simple, they may degrade thermally unstable compounds. After reducing the solid sample size, maceration is often preferred for heat-sensitive components (251). For instance, methanol maceration at 25°C yielded the highest anthocyanin concentration (300 mg/g) from grape skins. Similarly, Sultana et al. (252) found that methanol maceration was the most effective method for extracting flavonoids from citrus peels, resulting in high yields and purity. Additionally, catechin was extracted from Arbutus unedo fruits using maceration with 3.7% diluted ethanol at 79.6°C (253). While maceration typically involves prolonged extraction at room temperature, Soxhlet and heat reflux methods can complete extraction in just a few hours at 90°C (254).

While conventional extraction techniques offer advantages such as operational simplicity, cost efficiency, and proven effectiveness in isolating bioactive compounds, they present several notable drawbacks. Key limitations of this technique include extended processing times, high consumption of potentially hazardous organic solvents, and increased susceptibility of bioactive compounds to degradation due to environmental factors such as oxygen exposure, photolability, and thermal instability.

6.2 Novel extraction techniques

Contemporary extraction technologies have emerged to overcome the limitations of conventional methods, offering enhanced efficiency and improved yields of bioactive compounds, as shown in Table 1 and Figure 1. Modern extraction technologies include several advanced methods designed to improve efficiency and selectivity (246). These include as follows: UAE which uses sound waves to break plant cell walls; MAE which heats samples quickly using electromagnetic radiation; infrared-assisted extraction (IRAE), which applies focused thermal energy; PEFE which uses short electrical pulses to increase cell permeability; PLE which operates at high temperatures and pressures to enhance solvent penetration; SFE which uses carbon dioxide in a supercritical state as a solvent; SWE, which alters the properties of water under moderate conditions to improve extraction; and EAE, which employs specific enzymes to break down plant cell structures and release bioactive compounds (246). Each technique offers distinct advantages in terms of extraction efficiency and selectivity, while effectively addressing the inherent limitations associated with conventional methods (Table 2).

6.2.1 SFE

SFE is recognized as an innovative and environmentally sustainable extraction method (255). The supercritical state was first discovered in 1822 by French physicist Baron Charles Cagniard de la Tour, who identified unique alterations in solvent behavior at critical pressure and temperature thresholds (256). Later, in 1869, Thomas Andrews introduced the term “critical point” while studying the effects of pressure and temperature on carbon dioxide in a sealed glass tube. He defined this as the threshold at which the phase equilibrium curve terminates, marked by critical pressure (Pc) and temperature (Tc), beyond which the liquid and gas phases become indistinguishable (256).

Hannay and Hogarth (257) developed the principles of SFE and demonstrated that the supercritical properties of carbon dioxide (CO₂) could be successfully harnessed, marking a significant advancement in this technology. The first commercial application of supercritical fluid technology was developed in Germany for the decaffeination of green coffee beans using supercritical CO₂. Subsequently, Australia became a pioneer in employing liquid CO₂ for the extraction of hop oils in the brewing industry (258). By the 1980s, both techniques had been optimized and widely adopted for industrial applications across multiple countries (258).

SFE technology is currently used to manufacture various popular products across multiple industries, including chemicals, food, pharmaceuticals, and fuels (259). One of the key advantages of SFE is its ability to leave no harmful residues in the final product, making it particularly effective for extraction processes (259). These processes are primarily used for: (1) isolating beneficial bioactive compounds such as pigments, flavors, and other biomolecules, or (2) removing undesirable contaminants like pesticides, toxins, and organic pollutants (260, 261).

Extraction efficiency can be enhanced by incorporating a cellulose matrix into the solid substrate, which remains chemically inert to both the solvent and solute, while facilitating improved mass transfer and increasing overall extraction yields. SFE operates through two distinct phases: first, the supercritical solvent solubilizes target compounds from the solid matrix, followed by their subsequent separation from the solvent during controlled depressurization (262, 263).

CO₂ has emerged as the preferred supercritical solvent, owing to its favorable physicochemical properties, particularly its relatively low critical temperature (31°C) and moderate critical pressure (74 bar). These characteristics permit effective operation within practical pressure ranges (generally 100–450 bar) while maintaining process efficiency (264, 265). However, a limitation of CO₂ is its low polarity, which makes it ideal for extracting non-polar compounds (e.g., fats and lipids) but less effective for polar substances like many pharmaceuticals (266, 267).

To overcome this, chemical modifiers can be added to increase CO₂'s polarity (266–268). The addition of minimal solvent modifiers, such as little as 0.5 ml of dichloromethane (CH₂Cl₂), can significantly enhance extraction efficiency, yielding results comparable to those obtained through conventional 4-h hydrodistillation procedures (238, 269). SFE efficiency depends on carefully optimizing multiple operational parameters, which play a pivotal role in successfully isolating bioactive phytochemicals from plant matrices (238). Precise regulation of these critical variables is essential for achieving optimal extraction yields while maintaining process effectiveness (238).

Optimizing extraction parameters is crucial for achieving optimal results with SFE. Seven critical factors govern process efficiency as follows: (1) temperature, (2) pressure, (3) feedstock moisture content, (4) particle size distribution, (5) extraction duration, (6) CO₂ flow rate, and (7) solvent-to-feed ratio (270). SFE's superiority over conventional extraction methods stems from the unique properties of supercritical fluids, including tunable density, improved mass transfer characteristics (characterized by low viscosity and high diffusivity), and adjustable solvation power (271, 272).

These enhanced transport properties (notably 10–100 times greater diffusivity than liquids) facilitate deeper penetration into solid matrices and accelerated extraction kinetics (273). The method's hallmark characteristic is pressure-dependent density modulation, which enables precise control over solvent strength through manipulation of solubility. Compared to traditional techniques, SFE offers the following four distinct advantages: (1) use of non-toxic, GRAS-certified solvents, (2) increased extraction yields, (3) reduced processing times, and (4) direct compatibility with analytical instrumentation, including gas chromatography and SFC systems (255, 274).

6.2.2 SWE

SWE has gained recognition as an eco-friendly alternative for isolating bioactive compounds from plant and biological matrices (275). This method is particularly attractive for industrial-scale applications due to its high extraction efficiency, cost-effectiveness, operational safety, low energy requirements, and minimal environmental impact (276). These combined advantages—enhanced process efficiency and reduced environmental impact—have fueled growing research interest in SWE technology. The technique has proven effective for recovering valuable bioactive components, including proteins, polysaccharides, polyphenols, and antioxidants (277–279). A unique characteristic of SWE is its ability to modify the molecular structure of extracted compounds, potentially enhancing their biological activity (280).

SWE is an efficient and environmentally sustainable technology widely applicable across various extraction industries (281). SWE differs from conventional extraction methods by utilizing the altered physicochemical properties of water when maintained in its subcritical state, at temperatures between 100 and 374°C and pressures exceeding 22.1 MPa, thereby enhancing its solvating power for a wide range of polar and moderately non-polar compounds. This innovative approach provides an environmentally friendly, economically viable, and inherently safe extraction platform that eliminates the need for organic solvents (282). Water remains liquid at subcritical conditions (100-374°C) due to applied pressure, while its physicochemical properties undergo significant changes. As temperature increases, diffusion improves, while the dielectric constant, viscosity, and surface tension decrease (283).

Additionally, SWE promotes effective mass transfer through convection and diffusion (284). The SWE process proceeds through a series of interconnected stages that collectively enhance extraction efficiency. Initially, as temperature and pressure increase, solutes are desorbed from active binding sites within the plant matrix. These solutes are then solubilized and dispersed throughout the sample. Subsequently, based on their physicochemical properties and interactions with the matrix, the solutes partition into the subcritical water phase (284).

Finally, the extracted compounds are eluted from the extraction cell and collected using chromatographic or other separation techniques to ensure purity and analytical recovery (285–287). SWE method offers a highly tunable and efficient approach to extraction, making it a promising alternative to traditional techniques (286, 287).

6.2.3 UAE

This technique is a versatile energy source with widespread applications in manufacturing, medicine, and navigation (288). Ultrasound consists of sound waves at frequencies beyond human hearing (>20 kHz) and is utilized in industrial processes such as cleaning, degassing, emulsification, extraction, crystallization, and homogenization (289, 290). The UAE offers several advantages, including rapid processing, high selectivity, reproducibility, compatibility with thermolabile compounds, and superior energy efficiency, positioning it as an environmentally sustainable technology consistent with the principles of green chemistry and engineering (291). In recent years, the UAE has become an efficient method for extracting bioactive compounds from natural sources such as fruits, vegetables, algae, and fungi (292).

Unlike conventional extraction techniques, which often require prolonged heating and stirring (taking hours or even days), UAE can achieve comparable or superior results in minutes to a few hours (293). UAE is an advanced technology that outperforms conventional methods due to its efficiency and effectiveness. The mechanism involves ultrasonic waves disrupting cell walls, enhancing solvent penetration, and improving extraction efficiency. This method significantly reduces extraction time, solvent consumption, and energy usage (293). Additionally, the UAE aligns with green chemistry principles by facilitating the replacement of hazardous organic solvents with safer, GRAS alternatives, such as water–ethanol mixtures (294, 295). This shift enhances sustainability and safety in extraction processes while maintaining high yields (295, 296).

UAE offers numerous benefits, including faster processing times, simplified procedures, lower operational temperatures, reduced solvent and energy consumption, and higher extraction yields. This technique enhances mass transfer and leverages the cavitation phenomenon to improve extraction efficiency (297, 298). Several parameters influence the UAE process, such as frequency, sonication power, extraction duration, and ultrasonic wave distribution (299, 300). UAE has demonstrated high efficacy in isolating bioactive compounds from medicinal plants, owing to its ability to enhance mass transfer and disrupt cellular structures through acoustic cavitation (301).

Its key advantages include shorter extraction times, lower energy and solvent requirements, and improved precision. Additionally, the UAE enables faster energy transfer, better mixing, minimized thermal gradients, selective extraction, compact equipment design, quicker process adjustments, rapid startup, higher yields, and reduced unnecessary processing steps (302–304).

6.2.4 MAE

MAE has gained considerable attention as an efficient extraction method due to its minimal solvent requirements, shorter processing times, high reproducibility, improved recovery yields, enhanced selectivity, and reduced sample manipulation (305, 306). Initially introduced in 1986 for chemical synthesis, microwave energy was later adapted for extracting biological samples to analyze organic compounds. Today, MAE is widely applied across various sample types, including biological, environmental, and geological matrices (305).

In recent years, MAE has become increasingly prominent in research and development for extracting bioactive compounds from plant materials (242). MAE enables faster solute recovery compared to conventional techniques while maintaining high extraction efficiency. As a modern and sustainable method, MAE offers several key advantages, including the efficient extraction of thermolabile compounds, significantly reduced processing times, lower solvent usage, and enhanced isolation of bioactive constituents from plant matrices. These benefits position MAE as a valuable tool in green extraction protocols for natural product research and functional food development (307, 308).

Microwave radiation, a non-ionizing electromagnetic energy, spans frequencies from 300 MHz to 300 GHz (309). Two dominant frequency bands are employed in extraction applications: the 2,450 MHz band (standard in domestic microwaves and laboratory systems) and the 915 MHz band (favored in industrial-scale operations for its enhanced material penetration capabilities) (310, 311). In MAE, solvent selection plays a critical role in determining process efficiency, primarily through two key dielectric properties: the dielectric constant, which reflects the solvent's ability to be polarized in an electric field, and the dielectric loss factor, which indicates its capacity to absorb and convert microwave energy into heat. Together, these properties govern the solvent's microwave coupling efficiency and directly impact extraction performance (312).

Strategic solvent blending offers significant advantages in MAE by modulating dielectric properties to enhance the selectivity of the target compound. The use of low-dielectric solvents serves a dual purpose: (1) maintaining reduced temperatures to safeguard thermolabile components from degradation (313), while (2) creating a thermal gradient where the plant matrix preferentially absorbs microwave energy. This differential heating mechanism facilitates the rapid rupture of plant cell structures, promoting the efficient release and transfer of bioactive constituents into the cooler surrounding solvent phase (314, 315). Elevated temperatures in MAE enhance extraction efficiency by increasing molecular mobility and solubility, strengthening solvent-solute interactions, and generating intracellular pressure that disrupts cell walls, thereby facilitating the release of target compounds (293).

Reducing solvent viscosity improves solvent penetration and solute dissolution (316, 317). Additionally, as temperature rises, the solvent's viscosity decreases, improving its fluidity and dissolution capacity, thereby boosting extraction efficiency (318). Sample preparation involves homogenization, grinding, and milling for optimal solvent-cell matrix interaction. This approach is particularly effective in MAE of flavonoids, where MAE has demonstrated comparable or superior efficiency relative to conventional solvent-based techniques, often achieving higher yields in shorter extraction times (318). Extraction efficiency can be substantially improved by integrating advanced technology and refining process parameters (319).

6.2.5 PEFE

PEFE has gained recognition as an innovative and cost-effective processing technology for food and pharmaceutical applications (320). Initially developed for non-thermal microbial and enzymatic inactivation using short bursts of high-voltage electric pulses, this technique preserves product quality by minimizing thermal degradation, making it particularly suitable for heat-sensitive compounds (321). The first application of PEFE was demonstrated by Ganeva and Galutzov (322), who found that pretreating beer yeast with an electric field of 2.75 kV/cm before maceration significantly increased protein extraction yields.

Subsequent research has confirmed that PEFE treatment increases cell membrane permeability by inducing electroporation, thereby enhancing mass transfer and generating significant scientific interest in its application for the extraction of bioactive compounds (33). Numerous studies have since explored PEFE's potential, particularly for extracting bioactive compounds (323). PEFE technology has emerged as an efficient and gentle alternative to traditional cell disruption methods (324, 325).

PEFE involves the application of repetitive, short-duration electrical pulses, typically in the microsecond to millisecond range, at moderate field strengths (0.5–10 kV/cm) and low specific energy inputs (1–10 kJ/kg), targeting plant tissues to induce electroporation and facilitate the release of compounds (326). The treatment selectively increases membrane permeability while maintaining cell wall structure, stimulating the release of intracellular contents without thermal degradation (326, 327). The non-thermal nature of PEFE offers distinct advantages for extraction processes. When combined with mechanical pressing, PEFE pretreatment significantly improves both yield and quality of fruit and vegetable juices, including those from apples, grapes, and carrots (328, 329).

PEFE technology improves extraction efficiency by significantly reducing processing time, minimizing solvent usage, and operating at lower temperatures, thereby preserving thermolabile compounds and supporting environmentally sustainable practices (330). Additionally, this method enhances the extraction yields of high-value bioactive compounds, particularly polyphenols and natural pigments such as anthocyanins, carotenoids, and betaines, which can be efficiently recovered from both raw plant materials and agri-food processing byproducts (330–332).

6.2.6 PLE

PLE is an environmentally sustainable method for obtaining nutraceuticals from food and herbal sources (333). In contrast to conventional extraction methods conducted at ambient conditions, PLE utilizes solvents at elevated temperatures and pressures, thereby enhancing solvent penetration, solute solubility, and mass transfer rates (334). This approach enhances extraction efficiency by exploiting increased solute solubility and accelerated mass transfer rates that occur when solvents are heated above their atmospheric boiling points under pressurized conditions (334–336).

The PLE technique was commercialized in 1995 by Dionex Corporation under the trade name Accelerated Solvent Extraction (ASE^®). This extraction method is alternatively referred to as pressurized, accelerated, or enhanced solvent extraction in scientific literature (337).

When water is employed as the extraction medium, the process is designated explicitly as either superheated, subcritical, or pressurized hot water extraction (338, 339). PLE offers a greener alternative by reducing solvent consumption while increasing extraction speed. Its adjustable parameters allow for the selective targeting of specific bioactive compounds (340, 341). This method is especially advantageous when employing water or ethanol as solvents, both of which are classified as GRAS, aligning with green chemistry principles and enhancing their suitability for food and pharmaceutical applications (342, 343).

PLE has been successfully applied to extract thermally labile phytochemicals from various plant materials (344). The process operates in a controlled, inert environment, where solvents remain in a subcritical liquid state despite exposure to temperatures well above their boiling points, facilitated by elevated pressures (345). The combined application of high pressure and elevated temperature enhances overall extraction efficiency by maintaining solvent stability, increasing solute solubility, and accelerating desorption kinetics from the plant matrix (346, 347).

6.2.7 IRAE

Infrared radiation encompasses three spectral regions: near (0.78–3 μm), mid (3–50 μm), and far-infrared (50–1,000 μm). Notably, the penetration depth of infrared radiation is inversely proportional to its energy level (348). When applied to plant matrices, infrared radiation induces atomic and molecular vibrations, which are subsequently converted into thermal energy, facilitating the disruption of cell structures and enhancing the release of target compounds (348). This temperature increase promotes solvent evaporation and disrupts the plant matrix structure, thereby facilitating the liberation of target compounds (348). The far-infrared extraction technique provides unique benefits due to the strong absorption of water and organic compounds at wavelengths exceeding 2.5 μm (349).

By leveraging this phenomenon, researchers have successfully employed IRAE for the rapid and cost-effective isolation of flavonoids such as quercitrin, isoquercitrin, and rutin from Magnolia officinalis leaves. This approach is particularly valued for its operational simplicity, high extraction efficiency, and ability to produce flavonoid-enriched extracts with elevated concentrations of bioactive constituents (348). In another study, Wang et al. (349) pioneered an infrared-assisted self-enzymolysis extraction technique for the efficient isolation of total flavonoid aglycones, specifically oroxylin A, wogonin, and baicalein, from Scutellariae radix. In a comparative study, Cheaib et al. (350) evaluated various extraction techniques, including ultrasonic, microwave, and infrared, for the recovery of polyphenols from apricot pomace. Infrared extraction proved superior, producing the highest levels of total polyphenols (10 mg GAE/g DM), flavonoids (6 mg CE/g DM), and tannins (3.6 mg/L) (350).

IRAE consistently produced higher concentrations of key bioactive compounds, notably epicatechin, catechin, and rutin, demonstrating its efficacy in enhancing the recovery of polyphenolic constituents (351). The method's efficacy was further shown in polyphenol extraction from Salviae miltiorrhizae (danshen), where it enhanced the antioxidant capacity by 68% (from 47 to 79%) and increased the polyphenol concentration by 58% (from 0.12 to 0.19 mM) within a 30-min processing window. These results represent a significant improvement over traditional solid-liquid extraction techniques (351).

Chen et al. (351) also effectively isolated eight bioactive polyphenols from danshen (Salvia miltiorrhiza), specifically danshensu, protocatechuic acid, protocatechuic aldehyde, salvianolic acid B, dihydrotanshinone, cryptotanshinone, tanshinone I, and tanshinone IIA. This achievement underscores the versatility of modern extraction technologies in obtaining high-value phytochemicals from medicinal botanicals (351).

Similarly, a study by Abi-Khattar et al. (352) demonstrated the effectiveness of IRAE in recovering polyphenolic compounds, particularly oleuropein and hydroxytyrosol, from olive leaves, highlighting its potential as a rapid and efficient alternative to conventional methods (352). Their results showed a 30% increase in total phenolic content using IRAE compared to conventional water bath methods, resulting in a 27% reduction in ethanol consumption (352). Cao et al. (353) showed that IRAE offers distinct advantages over traditional techniques, including faster processing times, cost efficiency, higher extraction yields, and improved environmental sustainability. These benefits arise from the uniform radiative heating of samples, which enhances thermal efficiency and reduces energy waste (353).

6.2.8 EAE

EAE has emerged as a promising alternative to conventional techniques, employing specific hydrolytic enzymes to enhance cell wall degradation and facilitate the efficient release of target phytochemicals from plant matrices. This technique progressively replaces traditional solvent-based extraction due to its superior safety profile, environmental compatibility, and extraction efficiency (354). The method's principal advantage resides in overcoming a fundamental limitation in plant-based extraction which is the structural resistance imposed by cell wall constituents, primarily cellulose, hemicellulose, and pectin (354). The method effectively degrades these structural components through the strategic use of enzymes, such as α-amylase, cellulase, hemicellulase, and pectinase. This breakdown enhances solvent penetration to bioactive compounds, ultimately boosting extraction yield and efficiency (354).

Deng et al. (355) demonstrated that combining short-wave infrared pre-treatment with enzyme-assisted aqueous extraction significantly improved peanut oil recovery efficiency. In a related study, Lenucci et al. (356) reported that pretreatment of freeze-dried tomato samples with glycosidase enzymes before supercritical CO₂ extraction resulted in a threefold increase in lycopene yield (356). Boulila et al. (357) demonstrated that enzymatic pretreatment using cellulase, hemicellulase, and xylanase—either individually or in combination—significantly improves essential oil recovery from bay leaves. In a separate study, Sahne et al. (358) achieved enhanced curcumin extraction yields from turmeric by applying an α-amylase and amyloglucosidase enzyme cocktail.

In another study, Xu et al. (359) conducted a comparative study evaluating two extraction methods for polysaccharides from grape pomace: conventional ethanol extraction in comparison to enzyme-assisted extraction using a cellulase-pectinase-β-glucosidase cocktail. Their results demonstrated that the enzymatic approach provided dual advantages, increasing the yield of pectin. It preserved higher concentrations of phenolic compounds, particularly anthocyanins, while significantly reducing processing time compared to solvent-based extraction. Similarly, Vasco-Correa and Zapata (360) demonstrated that enzymatic treatment using protopectinase yields significantly higher pectin quantities from passion fruit peel than traditional chemical extraction methods (360). Roda et al. (361) demonstrated that enzyme cocktails comprising cellulase, hemicellulase, and pectinase effectively facilitate vinegar extraction from pineapple peel waste, a valuable byproduct in sugar manufacturing.

However, despite their improved extraction efficiency, advanced enzymatic methods may induce significant structural alterations in target bioactive compounds due to enzymatic bond cleavage, which can potentially affect their stability and biological activity (362, 363).

6.2.9 Natural deep eutectic solvents extraction (NDESE)

NDESE represents a revolutionary green extraction approach using naturally occurring compounds to form eutectic mixtures with unique solvating properties. Recent research by Ristivojević et al. (364) highlighted NDESE as a sustainable alternative to conventional organic solvents, offering biodegradability, low toxicity, and tunable extraction selectivity (364). Other studies also demonstrate that choline chloride-based NDESE can achieve extraction recoveries of 88.91%−98.99% for quercetin from plant sources, making them highly effective for polyphenolic compound extraction (365, 366).

6.2.10 ILE

ILE has gained significant attention due to the tunable physicochemical properties of ionic liquids, allowing for highly selective extraction processes. Recent advances focus on developing environmentally sustainable ionic liquids with reduced synthesis costs and improved recyclability (367). The technology shows particular effectiveness for extracting specific bioactive compound classes while maintaining high selectivity and minimal environmental impact (368, 369).

6.2.11 Emerging hybrid and green technologies

Current extraction research increasingly focuses on hybrid approaches that combine conventional and innovative methodologies (370), as systematically compared in Table 2.

6.2.11.1 Advanced integration strategies

Recent research emphasizes hybrid extraction approaches that combine multiple techniques to maximize efficiency (370). The integration of EAE-UAE has demonstrated remarkable synergistic effects, with enzymes creating porous cellular structures that allow ultrasound to penetrate more effectively (370). These combined approaches yield higher results at lower temperatures and shorter processing times than individual methods (237, 370).

6.2.11.2 Green solvent evolution

The field has witnessed significant advancement in green extraction solvents. Deep eutectic solvents, derived from natural compounds such as choline chloride, organic acids, and sugars, offer environmentally friendly alternatives to traditional volatile organic solvents (366, 370). These solvents demonstrate not only reduced environmental impact but also often enhanced extraction efficiency and compound stability (364, 366, 370).

6.3 Industrial scale-up and process optimization: automation and integration of AI

Advanced process optimization, utilizing AI and machine learning, has become crucial for maximizing extraction efficiency (370). Automated process control systems enable real-time monitoring and optimization of extraction parameters, significantly improving reproducibility and throughput (370). These technological advances address traditional challenges of parameter optimization and process control (237, 370).

6.4 Economic and environmental considerations

Recent studies emphasize the economic viability of advanced extraction methods through process intensification and energy recovery systems (371). While initial equipment costs remain high for technologies like SFE and PEFE, improved efficiency and reduced environmental impact provide long-term economic benefits (371, 372). The development of modular and scalable equipment designs has made advanced extraction technologies more accessible for various production scales (237, 353).

6.5 Future and emerging trends

Biorefinery concepts are increasingly being applied to extraction processes, maximizing the utilization of raw materials and by-products (237). This approach integrates extraction with downstream processing to extract maximum value from plant sources while minimizing waste generation (237, 371). Nanotechnology integration in extraction processes shows promise for enhanced selectivity and efficiency. Nanomaterials can improve adsorption and separation processes, while nanocarriers enable targeted delivery of extracted bioactive compounds (237).

6.6 Critical assessment of recent developments

Performance advantages of modern methods over traditional approaches have become more pronounced with recent technological improvements. Modern extraction techniques consistently demonstrate a 50%−80% reduction in extraction time, a 30%−70% decrease in solvent consumption, and a 20%−50% improvement in extraction yields compared to conventional methods (353, 373).

Sustainability metrics have become central to the evaluation of extraction methods, with life cycle assessment studies showing that, despite higher initial investments, modern extraction methods provide superior environmental performance through reduced solvent use, energy consumption, and waste generation (364, 368). Commercial viability continues to improve as equipment costs decrease and production scales increase. The growing availability of industrial-scale equipment for technologies like UAE, MAE, and PEFE has made these methods increasingly practical for commercial applications (353, 370, 372).

7 Immobilization of bioactive molecules

Bioactive compounds are non-nutritional food components that modulate metabolic processes and confer health benefits (374). They exhibit diverse therapeutic properties, including pancreatic lipase inhibition for the management of obesity (375), free radical neutralization (376), and anticancer activity (377). However, their practical utilization faces several challenges. Naturally occurring bioactive compounds, such as polyphenols and phytosterols found in fruits and vegetables, often exhibit undesirable sensory characteristics, including bitterness and astringency, which can reduce consumer acceptance. Furthermore, they frequently suffer from poor bioavailability, low bioaccessibility, instability under thermal or light exposure, and high volatility (378). These constraints significantly limit their functional applications (379). For instance, heat- and oxidation-sensitive compounds, such as vitamin C, may degrade during digestion or gastrointestinal transit (379, 380).

Bioactive compounds are highly susceptible to physicochemical degradation during food processing, storage, and digestion, compromising their functionality (381). To address this, microencapsulation has emerged as an effective strategy to stabilize these compounds, mask undesirable sensory properties, and improve bioavailability (382, 383). Recent advancements have facilitated the development of innovative encapsulation technologies designed to enhance the targeted delivery of bioactive compounds to specific physiological sites, thereby improving their stability, bioavailability, and therapeutic efficacy (384).

Emulsion formation, suspension, particle and gel preparation, hydrogel and microgel fabrication, liposome production, and coacervation have been optimized to create tailored delivery systems for bioactive food components (385–387). Compared to other delivery approaches, encapsulated bioactive compounds in particulate form offer distinct advantages due to their small and uniform size, ensuring efficient delivery to target areas. Encapsulation maintains the bioactivity of these compounds during both storage and digestion while improving their stability as they pass through the gastrointestinal tract (200). The process works by incorporating bioactive agents into a protective matrix, commonly known as a wall material or encapsulant (388, 389).

This technique generates micro- or nano-sized capsules, where bioactive compounds (known as the core, payload, or internal phase) act as functional agents, while wall materials (also termed the membrane, shell, coating, matrix, or external phase) create a protective barrier (390). Widely employed in the food and pharmaceutical industries, encapsulation serves as an effective strategy to protect sensitive bioactive compounds, such as polyphenols, micronutrients, enzymes, and antioxidants, from degradation caused by environmental and processing stresses (391). The protective matrix shields these compounds from degradation caused by environmental factors, including light, oxygen, pH variations, moisture, heat, mechanical stress, and other destabilizing conditions (390–392).

7.1 Bulk encapsulation assisted by ultrasound

Ultrasound technology is generally classified into two categories based on acoustic intensity: low-intensity ultrasound, primarily used for analytical and imaging purposes, and high-intensity ultrasound, which is applied for physical and chemical modifications, including extraction processes (393). Low-intensity ultrasound (typically using frequencies above 1 MHz at power intensities below 1 W/cm²) functions as a non-destructive analytical method for evaluating food components' physicochemical properties (393). This technique provides precise measurements while preserving the structural integrity of the material, making it particularly valuable for non-invasive food characterization (393, 394).

High-intensity ultrasound has become the leading technology for food processing and preservation (289). This method effectively alters the physicochemical properties of food components. Ultrasound technology plays a pivotal role in various applications, including the extraction of bioactive compounds, the modification of crystal structures, the inactivation of enzymes, the disruption of cellular matrices, equipment sanitation, emulsion formation, and other industrial processes (395). Beyond food applications, ultrasound technology exhibits remarkable versatility in creating catalytic and functional materials across diverse sectors (396, 397).

Its applications extend to medical imaging (290, 398), energy generation, and therapeutic/diagnostic medicine (399, 400). These varied applications primarily rely on acoustic cavitation—the generation and implosion of microbubbles induced by ultrasonic waves (401, 402). The versatility of ultrasound technology arises from its broad operational frequency range, which allows precise modulation of cavitation intensity and acoustic frequency (403). This controllability facilitates the fine-tuning of material properties, including particle size distribution, surface morphology, and structural integrity (403). Additionally, ultrasound can enhance drug absorption through encapsulation, a method designed to protect, prolong shelf life, or stabilize encapsulated substances against environmental degradation (403).

This method improves the bioavailability and therapeutic efficacy of drugs and nutrients by facilitating their absorption, stability, and targeted delivery within biological systems. Among various delivery platforms, food emulsions represent a particularly effective system (404, 405). Ultrasound technology has emerged as a preferred extraction technique due to its environmental sustainability, cost efficiency, rapid processing, and high yield of phenolic compounds, advantages primarily derived from the acoustic cavitation phenomenon produced by ultrasonic waves (406, 407).

7.2 Mass encapsulation through spray drying

Spray drying is the most established and extensively utilized encapsulation technique in the food industry, owing to its scalability, cost-effectiveness, and ability to produce stable, dry powders containing bioactive compounds (408). This versatile, continuous process offers cost-efficient production of encapsulated particles with diameters ranging from several micrometers to tens of micrometers, while maintaining a consistent particle size distribution (409, 410). Through spray drying encapsulation, bioactive compounds are protected and stabilized, and their solubility and controlled release are improved, ultimately delivering them in a convenient powdered form (411, 412).

As the predominant encapsulation method in food applications, spray drying encapsulates functional compounds within an inert carrier matrix (413, 414). This process improves microbiological stability while reducing storage and transportation costs through moisture reduction and water activity control, thereby minimizing chemical and biological degradation (415, 416). The technique offers notable advantages, including continuous, cost-effective operation with rapid processing times, and utilizes pressure, rotary, or twin-fluid nozzles. However, challenges include inconsistent droplet size distribution, limited control over particle uniformity, and potential nozzle clogging when handling suspensions (417, 418).

During operation, the rapid drying mechanism creates a protective dry layer around bioactive compounds (419). However, the high temperatures required for rapid water evaporation expose sensitive core materials to thermal stress, potentially degrading heat-labile compounds (420). To mitigate this, protective polymeric coatings, often proteins or carbohydrate-based, are combined with the bioactive solution to act as a thermal barrier (421, 422). Although energy-intensive, spray drying remains a highly scalable and efficient encapsulation method, capable of producing nano- to micron-sized particles with a narrow size distribution within a relatively short processing time (409, 423).

Spray drying is a phase-transition process that converts liquid feed into solid particles through atomization and rapid drying. This technique employs atomization to enhance drying efficiency by generating fine sprays, significantly increasing evaporation rates. Unlike conventional methods, spray drying achieves faster drying times (424, 425) while maintaining lower product temperatures due to evaporative cooling. Widely employed in both the food and pharmaceutical industries, spray drying is commercially utilized to produce a diverse range of powdered products, including milk, whey protein isolates, instant coffee, and tea extracts (426).

Beyond simple dehydration, it has evolved into a versatile method for microencapsulation, microbial inactivation, shelf-life extension, and product quality enhancement. However, a key limitation is its reliance on high temperatures, making it unsuitable for heat-sensitive compounds such as volatile aromas or bioactive substances (427, 428).

Extensive research has been dedicated to the encapsulation of bioactive compounds such as flavors, lipids, polyphenols, and pigments (e.g., carotenoids) (429). The efficiency of the encapsulation process and the quality of the final product are primarily influenced by key operational parameters, including inlet and outlet air temperatures, feed temperature, flow rate, and the physicochemical properties of the emulsion (429). These emulsion characteristics are, in turn, governed by multiple factors, including the composition of the oil phase, selection of wall material, core-to-wall ratio, total solids content, fluid viscosity, and the size and stability of dispersed droplets (430, 431).

7.3 Big batch encapsulation using spray chilling

Spray chilling involves the atomization and subsequent solidification of droplets to form encapsulated particles, sharing fundamental similarities with spray drying (432). The spray drying process comprises three fundamental components: an atomization unit that converts the liquid feed into fine droplets, a drying chamber where solvent evaporation and particle formation occur, and a collection system for recovering the dried, encapsulated particles (433, 434). During operation, a mixture of bioactive compounds and molten lipid carrier is atomized into a chilled chamber maintained below the lipid's melting point, where contact with cold air promotes rapid solidification into lipid microparticles that effectively encapsulate and preserve the active ingredients (435, 436).

The fundamental distinction between encapsulation techniques occurs during particle formation, where solidification occurs through droplet cooling or solvent evaporation (437). The process begins by dispersing active ingredients (flavors, vitamins, oils, or bioactive compounds) in a liquid matrix (waxes, fats, lipids, or hydrocolloids) before atomization. Upon cooling, the matrix solidifies to form microspheres or multi-core microcapsules (438). While spray freezing shares similar principles with spray drying (439, 440). Spray chilling employs cold air atomization rather than hot air (441, 442).

A notable limitation in encapsulating lipophilic substances is their potential inability to effectively mask undesirable flavors due to miscibility with the matrix (443). This challenge can be mitigated by employing non-miscible carriers such as sugar alcohols; for example, sorbitol was among the first crystallizing agents used to encapsulate and stabilize flavor compounds (443, 444). Spray freezing remains a proven lipid-based microparticle production method using spray dryer equipment (445, 446), while spray cooling with hydrophobic materials is gaining traction in food and pharmaceutical applications for producing smooth, spherical microspheres with uniform active ingredient distribution (447). Unlike many other microencapsulation techniques, spray cooling avoids high temperatures and ensures efficient release. It is known for being fast, user-friendly, and cost-effective, making it a preferred method for encapsulating heat- or moisture-sensitive functional compounds (448, 449).

7.4 Post-coating fluidized bed

Fluid bed coating is an encapsulation method that deposits protective layers onto powdered substrates, making it adaptable for both batch and continuous processing (450). The technique atomizes coating material onto fluidized particles to form uniform encapsulations (451, 452). Critical process parameters, such as nozzle atomization pressure, solid circulation rate, coating feed rate, and temperature, play a pivotal role in preventing particle agglomeration and ensuring uniform film formation.

As demonstrated by Guignon et al. (453), these factors ultimately govern coating efficiency and product quality. Therefore, precise optimization of processing parameters is essential to achieve uniform, high-quality coatings when employing fluidized bed technology (453). Various coating materials, such as gums, proteins, and starches, can be employed, making this method increasingly valuable for delivering a wide range of encapsulated food ingredients and additives to the industry (454).

Fluidized-bed coating utilizes different spray configurations, including top-spray, bottom-spray, and tangential spray methods (455). Three primary categories of factors influence the performance of the process: (a) operational parameters, including inlet air temperature, air velocity, spray rate, and atomization pressure; (b) environmental conditions, such as ambient temperature and relative humidity; and (c) thermodynamic variables, including outlet air temperature and moisture content (456).

The technique relies on suspending particles in a gas stream, allowing atomized shell material droplets to coat each particle individually (457, 458). Upon contact, these droplets form a protective layer. The gas stream performs two critical functions simultaneously: sustaining particle fluidization while supplying the energy required for solvent evaporation or coating solidification. This dual mechanism enables the precise regulation of the microcapsules' protective characteristics and release properties (459). Conventional fluidized bed systems typically employ a single-pass gas configuration, where the processing gas circulates through the bed only once before being discharged into the atmosphere (460, 461).

Fluidized bed coating is gaining prominence in the food industry for encapsulating ingredients and additives (454). Unlike pharmaceutical applications, where precision often justifies higher costs, food technologists must prioritize cost-effectiveness, requiring modified approaches for this relatively expensive technology (462, 463). While the pharmaceutical sector has extensively used fluidized-bed coating for drug formulations, creating films with controlled release, taste masking, enteric protection, enhanced stability, and improved appearance, the food industry adapts these principles with greater emphasis on economic feasibility (464, 465).

Fluidized bed coating is a versatile technique for optimizing, controlling, or altering the performance of functional ingredients and additives (466). Its applications span various food components, including processing aids (e.g., leavening agents and enzymes), preservatives (such as acids and salts), nutritional enhancers (like vitamins and minerals), and both natural and artificial flavorings (463). Coating materials, also referred to as shells, walls, or membranes, are composed of a wide range of natural or synthetic film-forming polymers, whose physicochemical properties have been extensively investigated in the context of edible coatings (467, 468).

Microencapsulation offers significant advantages, including extended product stability, taste concealment, easier processing, controlled release, and improved visual appeal, flavor, and coloration (469, 470). While pharmaceutical applications prioritize precision, the food industry's adoption of fluidized-bed coating technology emphasizes cost reduction in production (471).

7.5 Encapsulation through bulk lyophilization

Freeze-drying, also known as lyophilization, is a dehydration technique that involves freezing the sample and then removing the ice via sublimation under reduced pressure (472). The process consists of two key phases: primary drying, where sublimation occurs under low temperatures and moderate vacuum, and secondary drying, which involves desorption at higher shelf temperatures and lower chamber pressures (473, 474). Particularly suited for heat-sensitive materials, freeze-drying serves as an excellent method for microencapsulation (456, 475), operating through four key phases: freezing, sublimation, desorption, and storage stabilization (476, 477).

This dehydration technique is particularly valuable for heat-sensitive food and biological materials, utilizing sublimation to achieve extended shelf life while preserving essential qualities such as structural integrity, organoleptic properties (including taste, color, aroma, and texture), and bioactivity (478, 479). The composition and structural characteristics of the wall material predominantly govern the protective efficiency and release kinetics of encapsulated compounds (480, 481), with commonly used encapsulants including gum Arabic, maltodextrin, modified starches, whey proteins, and related biopolymers (481).

Despite its advantages, freeze-drying has notable limitations, including high energy consumption, prolonged processing times (482), and the formation of porous matrices, which may hinder sustained release performance (436, 483). While effective for shelf-life extension, the method suffers from substantial capital/operational expenses and offers limited control over final particle size distribution (484, 485).

8 Health benefits of plant materials

Plants synthesize a wide array of bioactive compounds with therapeutic potential, typically characterized by a predominant class of phytochemicals responsible for their principal health-promoting effects (Table 3 and Figure 7). Figure 7 illustrates the therapeutic potential of bioactive plant compounds, highlighting their roles in disease prevention and management through their antioxidant, anti-inflammatory, antibacterial, antidiabetic, neuroprotective, and cardioprotective properties.

Table 3

Table 3. Bioactive components derived from diverse plant sources that enhance health and their corresponding therapeutic benefits.

Figure 7

Figure 7. The therapeutic potential of bioactive plant compounds, emphasizing their involvement in disease prevention and management via antioxidant, anti-inflammatory, antibacterial, antidiabetic, neuroprotective, and cardioprotective actions.

A notable example is the apple (Malus domestica L.), which contains high concentrations of flavonoid antioxidants, including epicatechin, phloretin, and quercetin, as well as phenolic acids like chlorogenic acid and coumaroylquinic acid (486). Mandarin fruit pulp contains high levels of antioxidants (ascorbic acid, carotenoids, and phenolics), along with carbohydrates, minerals, and aromatic amino acids (487), while their peels are an excellent source of polyphenols (488). The health-promoting properties of mandarins are primarily attributed to their bioactive compounds, which exhibit potent antioxidant activity. Similarly, prickly pear (Opuntia spp.) represents a nutritionally dense fruit source, containing high levels of polyphenols, betalains, ascorbic acid, essential minerals, and amino acids (489). These constituents demonstrate multiple biological activities, including antioxidant effects, antiatherogenic and antiulcerogenic properties, and inhibition of LDL peroxidation (490, 491). Berry fruits, such as blueberries (Vaccinium spp.), blackberries (Rubus spp.), strawberries (Fragaria × ananassa), and grapes (Vitis spp.), are similarly rich in antioxidant compounds, with significant concentrations present in their extracts (492).

Research has demonstrated that polyphenols and ascorbic acid exert protective effects against a range of chronic diseases, including pulmonary disorders, rheumatoid arthritis, cardiovascular diseases, Parkinson's disease, and Alzheimer's disease (493, 494). Among vegetables, Allium species (garlic, onions, chives, and leeks) are particularly noteworthy due to their rich content of organosulfur compounds, as well as significant concentrations of flavonoids, steroidal saponins, and phytosterols (495). These bioactive components contribute to various therapeutic properties, such as immunomodulation, antiviral activity, blood glucose regulation, oxidative stress reduction, cancer prevention, inflammation suppression, and neural protection (496, 497). Similarly, Montesano et al. (498) reported that pumpkin (Cucurbita spp.) is rich in bioactive compounds, particularly terpenoids such as carotenoids, which demonstrate multiple health benefits, including immune system enhancement, a reduced risk of cancer and cardiovascular diseases, and support for prostate health. Similarly, scientific studies have identified rosemary (R. officinalis L.) as containing potent bioactive components that exhibit various therapeutic properties, including antifungal, antidepressant, antidiabetic, anti-inflammatory, and antithrombotic effects (499, 500). Extracts derived from medicinal and aromatic plants hold GRAS status, making them viable natural alternatives to synthetic additives (501). Sage (Salvia officinalis L.), for instance, demonstrates significant potential as a functional food additive, with documented anti-inflammatory, anticancer, antimicrobial, and antiproliferative activities (502).

Studies have demonstrated that Salvia officinalis L. (sage) possesses multiple therapeutic properties, including anti-inflammatory, anticancer, antimicrobial, and antiproliferative effects (502, 503). Wu et al. (504) reported that oregano (Origanum vulgare) possesses significant antibacterial and antioxidant capabilities. Similarly, Thymus vulgaris L. (thyme) contains several biologically active compounds, including thymol, carvacrol, geraniol, and p-cymene, which contribute to its therapeutic properties (505). These compounds exhibit neuroprotective effects, support respiratory health, and possess notable antibacterial activity (506).

Grape pomace, a byproduct of winemaking, is a cost-effective and nutritionally valuable source of bioactive compounds, including flavonoids, phenolic acids, and lignans (507). Research has demonstrated its therapeutic potential in managing various health conditions, including hypertension, atherosclerosis, neurodegenerative disorders, and cardiovascular diseases (507). Similarly, citrus processing generates significant byproducts abundant in flavonoids, limonoids, and essential oils (508).

The antioxidant properties of citrus waste stem from its bioactive components, while its essential oils demonstrate potent antibacterial, antifungal, and antiviral activities (508). Stevia rebaudiana serves as a remarkable natural reservoir of bioactive compounds, notably polyphenols, carotenoids, ascorbic acid, and chlorophylls (509, 510). Extensive research has established that stevia extracts exhibit diverse pharmacological effects, including potent antioxidant, antimicrobial, antihypertensive, antineoplastic, immunomodulatory, and anti-inflammatory properties. As reported by Bulotta et al. (511), olive leaf extracts possess multiple therapeutic properties, including antiviral, antitumor, antioxidant, anticancer, antibacterial, and cardiovascular benefits. In another study, Toufektsian et al. (512) examined the cardioprotective effects of anthocyanin-fortified maize in male Wistar rats using an 8-week dietary regimen (20% seed inclusion). Their results indicated a statistically significant (P < 0.01) reduction in myocardial infarct size after coronary occlusion-reperfusion injury compared to control diets, supporting the potential cardiovascular benefits of these phytochemicals (512).

Afshari et al. (513) evaluated the anticancer properties of eggplant extract using human gastric cancer cell lines, demonstrating significantly greater cytotoxic effects on malignant cells than normal cell lines. The study attributed these anticancer properties to the extract's potent antioxidant activity and high phenolic content, which may contribute to the neutralization of free radicals. These findings suggest that incorporating eggplant into the diet could serve as a preventive strategy against cancer development (513). Plant-derived polyphenols demonstrate anticancer potential by reversing harmful epigenetic alterations in malignant cells, suppressing tumor growth, blocking metastatic spread, and increasing tumor sensitivity to radiotherapy and chemotherapy (514).

As stated by Sharma et al. (515), pomegranate byproducts and waste extracts exhibit preventive and therapeutic effects against various types of cancer. Specifically, pomegranate extract suppresses prostate cancer cell proliferation and triggers apoptosis by inhibiting the NF-κB pathway (516). Faria et al. (517) reported that anthocyanin-pyruvic acid adducts and blueberry extracts showed notable anticancer activity against MDA-MB-231 and MCF-7 breast cancer cell lines by inhibiting cancer cell invasion and proliferation (517). Plant-derived terpenoids and carotenoids exhibit significant anti-inflammatory and anticancer properties, primarily by inhibiting NF-κB signaling pathways that are pivotal in inflammatory processes and cancer progression (518).

Anthocyanin-rich black currants show potential in managing hyperglycemia, as demonstrated in Caco-2 cell models by Barik et al. (519). Anthocyanins derived from black currants (Ribes nigrum) have been shown to primarily regulate postprandial glucose metabolism by inhibiting α-glucosidase activity. Their research further demonstrated that complementary phenolic constituents in black currants modulate several glycemic control mechanisms, including: (1) inhibition of salivary α-amylase activity, (2) regulation of intestinal sugar transporter function, and (3) enhancement of cellular glucose uptake. These synergistic actions may collectively reduce the risk of type 2 diabetes, as evidenced by corroborative studies using streptozotocin (STZ)-induced diabetic murine models. Yang et al. (520) demonstrated the glucose-lowering potential of puerarin (an isoflavone compound), with their 4-week intervention study revealing significantly improved insulin levels and marked hypoglycemic effects in treated subjects.

In complementary research, Anhê et al. (521) investigated the anti-inflammatory properties of cranberry polyphenols in murine models. Their 8-week dietary intervention with polyphenol-rich cranberry extract showed (1) significant enrichment of Akkermansia spp. populations, (2) attenuation of high-fat/high-sucrose diet-induced effects, including visceral adiposity, and (3) reduction in both intestinal inflammation and excessive weight gain (521). Whole-cereal grains, rich in phenolic compounds and dietary fiber, demonstrate beneficial modulatory effects on gut microbiota composition, potentially contributing to improved metabolic health, according to Gong et al. (522).

Emerging evidence suggests that properly processed high-cereal diets may offer therapeutic potential for various metabolic disorders. In cancer research, avocado seed extracts show dose-dependent anti-inflammatory and antiproliferative activity against human colorectal carcinoma (HCT)-116 and hepatocellular carcinoma HepG2 cell lines (523). As documented by Mirza et al. (524) and Donga et al. (525), mango peel byproducts have been characterized as a valuable source of bioactive polyphenols, with protocatechuic acid and mangiferin being particularly noteworthy for their demonstrated antimicrobial, antidiabetic, anti-inflammatory, and anticancer properties.

Research has similarly identified fruit and vegetable processing byproducts, including apple (526), cauliflower (527), elderberry (528), citrus (529), and pomegranate (530), that showed significant antimicrobial activity against Staphylococcus aureus. Similarly, agricultural byproducts from artichoke (531), banana (532), grape (533), orange (534), pomegranate (535), and tomato (536) showed antimicrobial activity against a range of pathogenic bacteria.

Table 3 illustrates bioactive components obtained from various plant sources that promote health and associated therapeutic advantages. Figure 8 demonstrates the main application areas of bioactive plant compounds, encompassing food preservation, functional foods, pharmaceuticals, nutraceuticals, cosmetics, and therapeutic formulations.

Figure 8

Figure 8. The main application areas of bioactive plant compounds encompass food preservation, functional foods, pharmaceuticals, nutraceuticals, cosmetics, and therapeutic formulations.

9 Plant-based functional food for human health

Global health awareness has reached unprecedented levels, accompanied by a growing emphasis on preventive healthcare strategies (537). Contemporary lifestyle challenges, such as occupational stress and irregular dietary habits, have led to nutritional deficiencies and associated health risks, thereby fueling global interest in functional foods and nutraceuticals due to their diverse health-promoting properties (538).

Functional foods are defined as either: (1) whole food ingredients or specific components used for targeted disease prevention and management (539), or (2) conventional foods enhanced with bioactive compounds, such as anthocyanin-enriched purple potatoes or carotenoid-fortified golden varieties (540). These specially formulated foods provide health benefits that extend beyond basic nutrition, including the reduction of chronic disease risk, while retaining the appearance, taste, and convenience of conventional dietary items (541).

Plant-based functional foods hold significant value due to their provision of essential nutrients, antioxidants, and bioactive compounds, which play a pivotal role in promoting and maintaining human health (5, 542, 543). The growing recognition of the disease-preventive potential of plant-based functional foods has stimulated extensive research into their immunomodulatory properties, driving increased consumer interest in adopting such diets for immune enhancement (55).

Scientific investigations have identified numerous bioactive compounds in these foods capable of regulating blood glucose levels (544). The active compounds can be divided into six main groups: flavonoids, steroidal saponins, polysaccharides, alkaloids, polyphenols, and other phytochemicals (544). Research highlights that polysaccharides from Ganoderma species enhance immune function by stimulating lymphocytes and myeloid cells to combat tumor development (545). Similarly, milkvetch (Astragalus), and ginseng (Panax) exhibit potent immunostimulatory effects (546). The key components responsible for strengthening immunity are polysaccharides, saponins, flavonoids, and alkaloids (547).

Natural polysaccharides, carbohydrate polymers formed by glycosidic bonds, exhibit multiple biological activities, including anticancer, immunomodulatory, and anti-inflammatory effects (128). Their low toxicity and minimal side effects make them attractive for immunity enhancement (548). These compounds have demonstrated the ability to concurrently stimulate innate immune responses and antigen-specific immunity, rendering them promising adjuvant candidates (548).

Emerging research confirms their immunostimulatory potential in both in vitro and in vivo systems, as evidenced by enhanced development of immune organs and increased secretion of immunomodulatory factors (549). Saponins, comprising triterpenoid or steroid aglycones, are increasingly recognized for their health-promoting properties in functional foods (550). Numerous studies have demonstrated the anti-tumor and immunomodulatory potential of plant-derived saponins (52), with pharmacological research confirming their immune-enhancing capabilities (551, 552).

Flavonoids, a major class of plant secondary metabolites, represent key bioactive components in functional foods (553, 554) and have attracted significant research attention for their immunostimulatory effects. Alkaloids are nitrogen-containing phytochemicals distinct from other nitrogenous compounds like proteins and amino acids (555), exhibit complex structures and diverse biological activities contributing to immune modulation (554). These compounds enhance immune function primarily by modulating the proliferation of thymic and splenic lymphocytes and regulating cytokine secretion (547). Other bioactive substances, such as terpenoids, essential oils, and organic acids, have shown notable potential in stimulating immune responses (547).

10 Food applications

The growing emphasis on healthy, sustainable nutrition has accelerated the utilization of plant-derived byproducts as sources of bioactive compounds (556). These substances serve multiple functional roles in food systems, including texture modification, antioxidant enhancement, antimicrobial protection, natural pigmentation, and nutritional fortification (557). Numerous studies demonstrate successful incorporation of byproduct-sourced bioactive compounds into diverse food matrices, enhancing both nutritional and functional properties in products such as yogurt (558), dry frozen fish (559), bread (560), petit Suisse cheese (561), beef patties (562), and cured sausage (563).

In food applications, the antioxidant capacity of these extracts correlates strongly with their total phenolic content, measurable through various analytical methods (558, 563, 564). Turgut et al. (564) fortified beef meatballs with pomegranate peel extract at a concentration of 10 g/kg (1,000 mg/100 g) and demonstrated that this addition significantly reduced lipid oxidation during refrigerated storage at 4°C, over 8 days. The 1% extract treatment showed comparable efficacy to synthetic butylated hydroxytoluene (BHT), reducing thiobarbituric acid-reactive substances by 53 and 50%, respectively, compared with the control (564).

Similarly, Choe et al. (565) reported that persimmon peel extract, applied at a concentration of 200 mg/100 g, effectively inhibited lipid oxidation in ground pork during a 12-day storage period at 3°C. Both extract and BHT treatments significantly lowered peroxide values (43 and 34% reduction, respectively) and conjugated diene formation compared to untreated samples, with the natural extract showing superior antioxidant performance (565). In another study, Ergezer and Serdaroğlu (566) investigated the antioxidant effects of artichoke byproduct extract (27 mg/100 g) compared to BHT in beef patties. The natural extract significantly outperformed synthetic BHT in inhibiting lipid and protein oxidation during storage, exhibiting a 42% higher total phenolic content and a 114% greater (2,2-diphenyl-1-picrylhydrazyl) DPPH radical scavenging capacity than the controls. In comparison, BHT showed minimal improvements, 4 and 9%, respectively (566).

Researchers attributed these superior results to the high phenolic content and antioxidant potential of the artichoke byproducts. Andres et al. (567) demonstrated that lamb patties supplemented with grape, olive, tomato, and pomegranate pomace extracts exhibited a 10%−21% reduction in mesophilic bacterial counts after 7 days of refrigerated storage compared to control samples (567). Comparable antimicrobial effects were reported in (1) pomegranate peel-fortified beef sausages and (2) shrimp treated with fruit byproduct-derived marinades (568, 569).

Nishad et al. (570) reported that meatballs formulated with nutmeg and citrus peel extracts (100 mg/100 g) exhibited significant antioxidant activity, effectively inhibiting both lipid and protein oxidation. Additionally, these formulations enhanced key sensory attributes, including color, aroma, flavor, and overall acceptability, throughout storage, compared to the control samples (570). Complementary studies demonstrated that chicken meat wafers incorporated with apple peel (2.5% w/w) or banana peel (2% w/w) exhibited similarly enhanced sensory characteristics, including improved flavor, texture, and overall acceptability (571).

According to Abid et al. (572), tomato pomace extracts were added to butter to evaluate their antioxidant effects. The supplemented butter containing 40 mg of extract per 100 g exhibited the lowest peroxide formation during storage, likely attributable to the high concentrations of lycopene and phenolic compounds in the extract. As reported by Bertolino et al. (573), the incorporation of hazelnut skin powder into yogurt increased its DPPH radical scavenging capacity and total phenolic content by 96 and 31%, respectively, compared to the control (573). Conversely, the growth of probiotics was enhanced when yogurts containing powdered pineapple peel were refrigerated at 4°C (574). Fresh orange juice fortified with banana peel extract (500 mg/100 ml) exhibited significantly enhanced antioxidant activity compared to the unfortified control, demonstrating approximately 21 and 150% higher scavenging capacity in the DPPH and ferric reducing antioxidant power (FRAP) assays, respectively (575).

In a recent study, Zaky et al. (576) investigated pasta formulations incorporating sunflower meal protein isolate (SMPI) at varying concentrations (3%, 6%, 9%). Their results demonstrated significant nutritional improvement in all supplemented samples, with optimal consumer acceptance at the 3%−6% SMPI inclusion levels (576). In complementary research, Kampuse et al. (577) reported that wheat bread enriched with pumpkin pomace powder (5.5-g/100-g dough) showed a 13-fold increase in carotenoid content compared to conventional formulations.

Numerous plant-based sources have demonstrated their capacity to enhance the total phenolic content and antioxidant efficiency in baked goods, including grape pomace (578, 579), plantain peel (580), mango peel (581), potato peel (582), raspberry and cranberry pomaces (583), beetroot pomace (584), apple pomace (585), rosehip, blackcurrant, and elderberry pomaces (586).

Table 4 illustrates the activities, mechanisms, and advantages associated with the use of plant-derived bioactive compounds in the food sector.

Table 4

Table 4. Application of plant-derived bioactive compounds in the food industry: functions, mechanisms, and benefits.

11 Economic cost evaluations

A comparative analysis between conventional and contemporary extraction techniques is essential; however, limited research has comprehensively addressed this topic. Essien et al. (587) conducted an economic assessment of bioactive compound extraction from kanuka leaves using ethanol and subcritical water methods. Their analysis revealed that SWE was more cost-effective, with a manufacturing cost of NZ$4.49 million and a unit cost of NZ$2.14/kg, compared to ethanol extraction, which incurred NZ$4.7 million in manufacturing costs and a unit cost of NZ$5.57/kg (587).

Similarly, Lopeda-Correa et al. (588) reported that UAE (US$3.86/flask) was more economical than Soxhlet extraction (US$5.80/flask) for recovering polyphenols from Adenaria floribunda stems. Together, these studies highlight the greater cost-effectiveness of modern extraction techniques (588).

12 Challenges and limitations

The growing demands of global food production necessitate the development of improved extraction methods to yield high-quality bioactive compounds for industrial use. Although conventional extraction methods remain widely used, their environmental limitations, such as high energy consumption, reliance on toxic solvents, and thermal degradation of heat-sensitive compounds, pose significant challenges to sustainable production practices (589).

In contrast, emerging green extraction technologies offer faster, more selective, and eco-friendly alternatives with better temperature control, though further validation is needed for large-scale industrial adoption (590). Despite their potential, many emerging extraction technologies face prohibitive costs and scalability challenges, as industrial-scale equipment often remains in prototype stages or requires custom designs (590). However, the food manufacturing sector anticipates advancements to address these limitations. Meanwhile, growing consumer health consciousness has driven demand for nutrient-dense, plant-derived foods, increasing the availability of purified plant extracts for industrial use (591). These extracts, often concentrated or refined into premium nutraceuticals and dietary supplements, offer demonstrated health benefits, including LDL cholesterol reduction, blood pressure management, atherosclerosis mitigation, cognitive enhancement, oxidative stress reduction, and anticancer properties (591).

Commercial grape seed extracts, such as ORAC-15 M™ (Ethical Naturals, Inc., Novato, CA, USA), are standardized to contain 80% polyphenols and exhibit an oxygen radical absorbance capacity (ORAC) of 15,000, and they are marketed for their potential in mitigating oxidative stress. Applied Food Science Inc., Kerrville, Texas, USA, provides a range of premium plant-based extracts, such as GCE-50™ green coffee extract standardized to 50% chlorogenic acids, PureGinger™ organic powder with 2% gingerol content, CoffeeNectar™ cascara fruit extract, and PurTea™ concentrated green tea caffeine (592).

While these phenolic-rich extracts offer superior antioxidant activity, higher concentrations may impart bitterness, aftertaste, or color changes in final products (593). Despite their potential, widespread adoption faces challenges, including limited human clinical trials and animal studies, which hinder assessments of bioavailability and market validation. Further research is needed to evaluate in vivo efficacy, safety (including toxicity, cytotoxicity, and allergenicity), and regulatory standards to ensure consumer protection against misleading claims (35).

The inclusion of plant bioactive compounds in functional foods faces a complex landscape of global regulatory challenges. Key obstacles include divergent regional requirements, ingredient safety concerns, labeling constraints, health claim substantiation, and the lack of harmonized international standards (594, 595). Different regions, including the EU, the USA, Asia, and Canada, define, regulate, and categorize functional foods and bioactive ingredients in varying ways. For example, the EU uses a negative list for prohibited botanicals and requires pre-market approval for novel foods, whereas Japan has specific categories, such as Foods for Specified Health Use (FOSHU), that demand government certification and scientifically substantiated claims (595). In the USA, botanical ingredients must comply with GRAS notifications or new dietary ingredient notifications for supplements, but regulatory clarity for functional foods is limited (595, 596).

Authorities typically require extensive safety evidence, including toxicological data and proof of the absence of contaminants, for plant-based ingredients. The variability introduced by different plant species, growing regions, and processing methods makes standardization challenging (594). Establishing maximum daily intake limits and monitoring for potential adverse effects (including food-drug interactions) are mandated in regions like Canada and South Korea, adding to the regulatory burden (594).

Labeling requirements for functional foods containing botanicals vary greatly. In Canada and South Korea, detailed labeling of bioactive content, function, and warnings is compulsory (595). In the EU and Japan, only claims approved after rigorous scientific assessment may be placed on products. Misleading or unsubstantiated health claims are a major concern, with severe penalties and product recalls possible if regulatory standards are breached (594, 595). The absence of global uniform guidelines means companies must navigate fragmented legal frameworks. This often results in increased costs, delays, and product reformulation for cross-border trade. Regulatory requirements for documentation, scientific substantiation, and language of claims further complicate market entry for functional foods with plant bioactive compounds (597).

Regulatory approval for new plant-derived bioactive ingredients, such as those obtained by novel extraction or biotechnological processes, often requires case-by-case risk assessment, further delaying product launches (595). Integrating traditional medicinal plants into mainstream foods also presents a challenge, as authorities scrutinize both the history of use and contemporary scientific evidence (594, 595).

13 Gaps, future studies, and conclusion

This comprehensive review addresses critical knowledge gaps in bioactive plant compounds research by identifying three primary areas requiring immediate scientific attention: regulatory harmonization challenges, extraction technology limitations, and commercial scalability barriers. The growing consumer preference for functional foods, driven by rising chronic diseases including obesity, diabetes, and cardiovascular disorders, has created an urgent need for evidence-based solutions that current literature fails to address (598, 599) adequately.

The most significant gap lies in the absence of standardized global regulatory frameworks for functional foods containing bioactive plant compounds. While the European Commission's CLYMBOL Project represents the first multinational effort to examine the influence of health claims on consumer behavior, comprehensive international harmonization remains elusive (599, 600). Current regulations vary dramatically across jurisdictions—from Japan's FOSHU certification system to the EU's negative lists of botanicals and the US GRAS notification requirements—creating substantial barriers to global commercialization. This regulatory fragmentation forces manufacturers to navigate complex, region-specific approval processes, significantly increasing development costs and time-to-market delays (597, 600).

Extraction technology limitations present another critical research gap, particularly in terms of industrial scalability and environmental sustainability. While advanced techniques such as SFE, MAE, and UAE demonstrate superior efficiency in laboratory settings, their commercial implementation faces substantial challenges, including high capital investments, concerns over energy consumption, and difficulties with process standardization. Recent studies indicate that up to 80% of bioactive compound research remains confined to laboratory scales, with limited pilot-scale validation and virtually no large-scale industrial applications (601, 602).

The bioavailability and delivery system challenges represent a third significant gap that this review systematically addresses. Current research predominantly focuses on compound extraction and characterization, while neglecting critical aspects such as bioavailability enhancement, targeted delivery, and stability preservation during food processing and storage. The variability in individual responses due to factors such as age, gender, metabolism, and lifestyle creates additional complexity that the existing literature inadequately addresses (601, 602).

Future research priorities must focus on developing hybrid extraction technologies that combine multiple approaches to optimize efficiency while minimizing environmental impact. The integration of AI and machine learning for parameter optimization represents a particularly promising direction that could address current scalability challenges. Additionally, establishing standardized analytical methods for characterizing bioactive plant compounds and assessing their bioactivity is essential for ensuring reproducibility and facilitating regulatory approval processes (601, 602).

The current review highlights sustainable biorefinery concepts, focusing on the essential requirements for waste valorization and the application of circular economy principles in the synthesis of bioactive compounds. This approach not only reduces environmental impact but also enhances economic viability by maximizing raw material utilization and generating multiple revenue streams from a single extraction process.

Ultimately, the pressing need for international regulatory harmonization necessitates collaborative efforts among global food safety authorities to develop unified standards for functional foods, thereby facilitating seamless cross-border trade while ensuring consumer protection and product safety.

Author contributions

ME-S: Formal analysis, Methodology, Resources, Writing – original draft, Writing – review & editing. AS: Data curation, Software, Supervision, Writing – original draft, Writing – review & editing. DM: Methodology, Resources, Writing – original draft, Writing – review & editing. SA: Formal analysis, Methodology, Writing – original draft, Writing – review & editing. TA: Formal analysis, Software, Writing – original draft, Writing – review & editing. MF: Project administration, Resources, Software, Writing – original draft, Writing – review & editing. AE: Formal analysis, Methodology, Writing – original draft, Writing – review & editing. UA: Methodology, Resources, Writing – original draft, Writing – review & editing. AA-E: Methodology, Software, Writing – original draft, Writing – review & editing. WM: Methodology, Project administration, Resources, Writing – original draft, Writing – review & editing. SA: Writing – original draft, Writing – review & editing. KE-T: Funding acquisition, Investigation, Writing – original draft, Writing – review & editing.

Funding

The author(s) declare that financial support was received for the research and/or publication of this article. This project was funded by the UAEU program of Advanced Research (grant number: 12S169) and Khalifa Center for Biotechnology and Genetic Engineering-UAEU, grant number 31R286. The authors extend their appreciation to King Khalid University for funding this work through Large Research Project under grant number (R.G.P.2/330/46).

Acknowledgments

The authors extend their appreciation to the Deanship of Research and Graduate Studies at King Khalid University for funding this work through Large Research Project under grant number (R.G.P.2/330/46).

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Generative AI statement

The author(s) declare that no Gen AI was used in the creation of this manuscript.

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Publisher's note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Abbreviations

PUFA, polyunsaturated fatty acid; MUFA, monounsaturated fatty acid; SFA, saturated fatty acid; MCFA, medium-chain fatty acid; LCFA, long-chain fatty acid; HUFA, highly unsaturated fatty acid; ROS, reactive oxygen species; DNA, deoxyribonucleic acid; RNA, ribonucleic acid; EPS, exopolysaccharides; AI, artificial intelligence; CFD-DEM, computational fluid dynamics–discrete element method; HFD, high-fat diet; GC-MS, gas chromatography–mass spectrometry; PEFE, pulsed electric field extraction; MAE, microwave-assisted extraction; UAE, ultrasound-assisted extraction; SFE, supercritical fluid extraction; IRAE, infrared-assisted extraction; EAE, Enzyme-assisted extraction; ILE, ionic liquid extraction; SWE, subcritical water extraction; FBC, functional bioactive compound.

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