Abstract
Mesoporous silica nanoparticles (MSNs) are widely used as a promising candidate for drug delivery applications due to silica’s favorable biocompatibility, thermal stability, and chemical properties. Silica’s unique mesoporous structure allows for effective drug loading and controlled release at the target site. In this review, we have discussed various methods of MSNs’ mechanism, properties, and its drug delivery applications. As a result, we came to the conclusion that more in vivo biocompatibility studies, toxicity studies, bio-distribution studies and clinical research are essential for MSN advancement.
Introduction
One of the most important purposes pursued by nanotechnology is the production of nanoparticles that have the desired distribution of drug in the body (; Tandel et al., 2018). Over the past two decades, researchers have concluded that a vital step in the development of drugs is to focus on designing new drug delivery systems (NDDS) (Martínez-Ortega et al., 2019). Ideally, all new systems should improve the stability, absorption, drug concentration, and long-term release of the drug in the target tissue. In addition (), reducing the number of drug injections to increase patient comfort (Reibaldi et al., 2019), advanced drug delivery systems (), pharmacokinetics of proteins (Turner and Balu-Iyer, 2018), and peptides () that are usually low in half-time should be considered. The ultimate goal of the drug research is to safely transfer the drug to the suitable location in the body at the right time (; Yin and Zhang, 2020). However, for many drugs, these ideals are often impossible. For example, the oral method is usually the best way to use a drug due to non-invasiveness, but peptides and proteins will be absorbed and effectiveness will be reduced due to the acidic properties of the stomach, as well as the effects of the first transfer of the liver, such as drug loss due to metabolic processes prior to systemic rotation and resistance by the intestine (; ). Finally, its accessibility will be greatly diminished. Nanotechnology, with the elimination of many problems with traditional drugs, allows the application of oral drugs that were previously not usable. In some cases, co-administration of the drug with nanoparticles can increase the bioavailability of the drug in a way that is useful for oral use (). Nanoparticles protect the drugs that are susceptible to degradation in the body and give more durability to the drug’s presence in the blood, attach the drug to the target tissue, release the drug in the target site, and increase the efficacy of the drug several times over (McClements, 2018; Paunovska et al., 2018). The main roles of the preparation of nano-drug delivery systems are to control particle size (), surface properties () and release of the drug in a good therapeutic dose (). Generally, by fabricating silica, the micelles self-assemble around a template and then remove the template using a suitable method such as calcination The design and manufacture of controlled drug release systems can be very helpful in cancer drug therapies. So far, many substances have been introduced as drug release systems, among which biodegradable polymer materials (), ceramic materials such as hydroxyapatite (Martínez-Vázquez et al., 2015), and calcium phosphates () can be mentioned. Recently, mesoporous materials have attracted the most attention in this regard. In fact, the porosity of silica mesoporous materials allows biologically active molecules of different sizes to locate in the cavities of these materials (Vallet‐Regí et al., 2007). Also, the regular porosity of these materials makes it possible to achieve a convenient loading and release rate (). Conversely, as the adsorption of molecules into mesoporous (Manzano and Vallet-Regí, 2019) is a surface phenomenon and the specific surface of these materials also results in the absorption of more active biological molecules (Manzano and Vallet-Regí, 2019). What is important in designing a drug release system is biocompatibility and biodegradability (). Recent research is based on the development of drug delivery systems that are stable in structure and capable of carrying large volumes of drugs without the problem of early release to target tissues or even small intracellular organs (Manzano and Vallet-Regí, 2019). Among many of the materials that have been investigated in terms of their stable structure for drug delivery, silica mesoporous nanomaterials are known to be biocompatible with defined structures and certain surface specific properties (). Silica mesoporous is known as a selective material for the biological applications of inorganic nanoparticles. Typically, silica meso-nanostructure coated with semiconductor quantum dots, such as high-stability cadmium sulfide and selenide (Sharma et al., 2019; Tarrahi et al., 2019), has the potential for chemical change and high biocompatibility that can be used for many diagnostic biomedical applications. In addition, meso silica nanoparticle can be applied to increase the biocompatibility of several drug delivery systems, such as magnetic nanoparticles (Vallet-Regí et al., 2018), biopolymers (Nairi et al., 2018) and micelles (Zhang et al., 2019). In this article, we have reviewed and studied the introduction of various types of silica mesostructure and their application in various drug delivery processes, the advantages of the application of silica nanoparticles in drug delivery systems, and biocompatibility and mechanism reception by the host cell.
Mesoporous Silica Materials and its Synthetic Method
In general, the porous nanoparticles are divided into three groups according to their size: Microporous (pore size: <2 nm), mesoporous (pore size: 2–50 nm) and macroporous (pore size: >50 nm) (Vallet-Regí, 2012). The mesoporus silica was produced in two steps: first, the micelles self-assembled around a template and then the template was removed via calcination (Figure 1). Mesoporous nanomaterials with a well-defined architecture have a high density of silanol (Si-OH) functional groups at their surface that can be modified with a wide range of organic groups to stabilize biomolecules and other applications (Wang, 2009).
FIGURE 1
Chen and coworkers developed the “DOX@MSNs-CAIX” targeted and redox-responsive drug delivery system, in which MSNs were used as the vehicle for loading chemotherapeutic drug doxorubicin (DOX) and CAIX grafted on MSNs by disulfide bonds. MSNs-CAIX are a promising medication delivery method for cancer treatment with a specific target (Meynen et al., 2009).
In some cases, additional functional groups penetrate into the mesoporous nanoparticles due to fills the silica walls, and consequently reducing the size of the pore and drug loading, despite the fact that this controls drug release. Modification of the nanoparticles surface with a variety of functional groups can cause changes in electrostatic forces, hydrophilic or hydrophobic forces, and internal reactions of the drug and the matrix (Meynen et al., 2009). Various methods for producing silica mesoporous nanomaterials have been reported that show, with sufficient knowledge of preparation methods, pore size engineering, morphological control, and structural properties, that these materials can be of good quality. In addition, the manufacturing of these materials by modifying different of agents, such as a diversity of surfactants, acquires the specific mechanism and the internal reaction of silica with template molecules (Wang et al., 2016; Yi, 2021). For example, through direct reaction of S+I−, they occur between a positively charged molecular based organized system (MOS) activating surface ion by and a negatively charged silicate source. Two kinds of mechanisms including liquid crystal templating, self-assembly mechanisms have been proposed for mesoporous synthesis (Meynen et al., 2009). Figure 2 presents an overview of possible pathways for their synthesis.
FIGURE 2
These materials can also be manufactured using surface activators called polymeric based organized systems (POS) through the indirect reaction of template with a silicate source in an acidic media. Conversely, the interaction between the MOS and the inorganic silicate source (S0I0) leads to the formation of hollow mesoporous silica (HMS) materials (Meynen et al., 2009). Many factors such as pH, salts, inflammasome, co-solvents, co-surfactants, concentration, specific silicate source, solvent, and temperature are involved in the organization of mesopores (Zhao et al., 2000). In a typical method of preparation of mesosilica materials, the dissolution of template molecules in the solvent and the addition of a silicate source such as tetraethoxy ortho silane (TEOS), meta silicate (Na2SiO3), and gaseous silica are performed. After some time at a certain temperature, the hydrolysis and condensation processes begin. Finally, the resulting product is washed and dried, and by removing the mold using calcining, the silica mesoporous is obtained ().
Mesoporus silica nanoparticles have shown to have excellent properties for biomedical applications. These properties includes porous ordered and well aligned structure, which shows fine control of drug delivery and release kinetics; larger surface area and pore volume, which shows high potential for molecule loading and dissolution enhancement; tunable particle size in between 50 and 300 nm which is suitable for facile endocytosis by living cells; and silanol-contained surfaces have two functional surfaces with cylindrical pore surface, exhibit better control over drug loading and release; and have excellent biocompatibility.
The oral route is the most popular route for drug delivery, despite the fact that many medicines, particularly highly pH- and/or enzymatic biodegradable peptide substances, are extremely difficult to manufacture and obtain efficient intestine absorption. Only if the drug 1) is substantially present as a solution in the gastrointestinal tract, 2) is able to penetrate through the intestinal mucus, 3) overcomes the various gastrointestinal barriers, and 4) provides an effective therapeutic dose that is efficient for systematic absorption of an active substance, is oral ingestion possible. As a result, improving the oral bioavailability of poorly soluble medications is still a major challenge for the pharmaceutical industry. Despite the fact that several traditional drug carriers have solved some of the problems associated with the oral delivery of poorly soluble medicines, only a few have fulfilled commercialization requirements. Due to these limitations, scientists have begun to rethink their methods for targeted drug delivery systems and researchers have begun looking for alternate vectorized carriers ().
Lee et al. synthesized MSNs with varying concentrations of positive surface charges (Lee et al., 2008). The positive surface charge was achieved by directly co-condensing a TA-silane and tetraethoxysilane (TEOS) in the presence of a base as a catalyst and inserting trimethylammonium (TA) functional groups into the framework of MSN (MSN–TA). These MSN–TA samples have well-defined hexagonal structures with an average particle diameter of 100 nm, pore size of 2.7 nm, and surface area of about 1,000 m2 g−1. Anionic drug molecules, Orange II (a fluorescent tracing molecule), and sulfasalazine (an anti-inflammatory prodrug used for bowel disorders) were successfully loaded into these MSN–TA samples and persisted within the MSN–TA in an acidic environment (pH 2–5) (Li et al., 20211196). Guha and others developed poly (methacrylic acid-co-vinyl triethoxylsilane) coated MSN with better hypoglycemic effect for insulin delivery (). Ang and coworkers have reported the synthesis of MCM-41 nanoparticles using sol-gel method for oral delivery of MCC7433 and pretomanid and its surface was modified with phosphonate and amino groups (). The impact of various structural features of MSNs on protein loading, protection, and delivery performance have been reviewed by Xu and coworkers. They also discussed the current state of MSN research in enzyme mobilization, catalysis, intracellular delivery, extracellular delivery, and antimicrobial protein delivery (Xu et al., 2019). Janjua and coworkers have developed a room temperature procedure for synthesizing ultra-small silica nanoparticles with large pore sizes that can load high amounts of chemotherapeutic medicines and attach a targeting moiety to their surface for the first time. To accomplish additional active targeting, the nanoparticles were coupled with lactoferrin (>80 kDa), whose receptors are overexpressed by both the blood-brain barrier and glioblastoma ().
Meka et al. studied the solubility, permeability, and anti-cancer activity of vorinostat encapsulated within MSNs with various functional groups. When vorinostat was encapsulated in pristine MSNs, its solubility was increased by 2.6 fold when compared to the free drug (MCM-41-VOR). When MSNs were treated with silanes with amino (3.9 fold) or phosphonate (4.3 fold) terminal functional groups and solubility were increased even further. Also, MSN-based formulations considerably improved vorinostat permeability into Caco-2 human colon cancer cells, particularly MSNs modified with an amino functional group (MCM-41-NH2-VOR), where it increased by fourfold (Meka et al., 2018).
Types of Silica Mesoporous Systems
The meso-silica, due to their high thermality, chemical stability, high surface area, and good compatibility with other materials meso-silica systems, they have found wide applications in adsorption, enzyme stabilization and particularly drug delivery. These structures are MCM (Mobile Composition of Matter), SBA (Santa Barbara Amorphous), TUD (Technische Universiteit Delft), HMS (Hollow Mesoporous Silica) and MCF (Meso Cellular Form) (Yue et al., 2000; ; Martínez-Edo et al., 2018; Wang et al., 2018).
Mobile Composition of Matter
These adsorbents are the first material in the mesopores generation that were synthesized in1992, which was the first step in the design of novel silica meso-carriers (Vadia and Rajput, 2011). The two groups identified from this family are MCM-41 () and MCM-48 (). The synthesis of these materials is based on the creation of a liquid crystalline mesophase of surfactants that takes place in an acidic or base media (). Their appearance, shape, and pore size can be changed by manipulating pH and adding co-solvent. During the synthesis of MCM, from CTAB (Cethyl trimethyl ammonium Bromide) cationic surfactant, which is strongly stirred in a high-temperature in a basic solution are apply. TEOS is then added and the resulting solution is heated at high temperature to be stirred for 2 h. After the reaction is complete, the product is filtered, rinsed with water and ethanol and then dried under vacuum. The surfactant is then removed by acid wash (Figure 3) ().
FIGURE 3
Depending on the synthesis conditions, inorganic silica templates can be hexagonal, irregular, cubic, and so on. The first case was reported in the release of silica porous mesoporous to carriers of MCM-41 with ibuprofen (Salonen et al., 2008). Kavallaro et al. used Al Si- MCM-41 mesoporous silica for drugs such as difflonisal and its sodium salt and naproxen. Qiu and et al. investigated the Si-MCM-41 system as carrier of the drug captopril in water. They obtained a cavity size of 4.3 nm and a loading of 32.5%, while Kavrallo et al. obtained a cavity size of 2.79 nm and a total of 15.6% loading. The lower drug loading for Al Si-MCM-41 is presence of Al and Si metals of loaded in the MCM-41 pores, so if the size of the pore is less, the amount of drug loading is increases ().
Zeng et al. synthesized MCM-41 with the organic group of aminopropyl as carriers of aspirin and the results showed its release properties were influenced by the amount and distribution of aminopropyl groups in the pores wall and their regular structure (Zeng et al., 2005). MCM-48 is another mesoporous carrier from MCM group that has the three-dimensional shape group and cubic cavities, and the delayed release of the erythromycin antibiotic from this adsorbent was observed (). Lz-quierdo-Barba et al. conducted synthesis of MCM-48/erythromycin and MCM-48/ibuprofen nanocarriers. They illustrate that both have good release (). Also, these matters have been reported to increase the dissolution rate of piroxicam analgesic (Patil et al., 2019).
Santa Barbara Amorphous
In1998, silica materials with regular meso pores synthesized in acidic conditions using non-ionic copolymers were synthesized with high amounts of polyethylene oxide and polypropylene oxide such as F-127 and P-123 pluronic (Speybroeck et al., 2009). The naming of these batches is based on their shape, such that the SBA-1 has a cage shape with cube circular pores (), SBA-11 (cubic) (), SBA-3 has a six-sided cylindrical porosity shape (), SBA-14 (sheet) (Yu et al., 2018), SBA-15 has a two-dimensional hexagon shape (Margolese et al., 2000) and SBA-16 has a cubic cage structure (Rivera-Muñoz and Huirache-Acuña, 2010). Among these mesostructures, the SBA-15, followed by the SBA-16, quickly became the focus of attention. Because they have desirable surfaces, physicochemical properties such as low toxicity, biocompatibility, biodegradability, low-cost sources for synthesis, and are widespread their daily applications (Speybroeck et al., 2009). The SBA mesoporous pore wall is thicker than the MCM; although their specific surface area and pore volume are smaller than the MCM group, but they have a high mechanical and thermal stability (Speybroeck et al., 2009). Recently, the use of SBA-15 as a drug carrier has been evaluated and proven to have a structural shape and pore size effect on atenolol release. The appearance of the properties can be changed by altering the synthesis temperature. It also appears that SBA-15 is leading to the slow release of drugs (Speybroeck et al., 2009). Wang et al. showed that the choice of aqueous and non-aqueous solvents for loading into the SBA-15 had a significant effect on the rate of drug dissolution (Wang, 2009). An acceptable therapeutic target of hybrid porous mesoporous silica to which amine functional groups were added was also observed in folic acid loading (Figure 4) ().
FIGURE 4
Melaerts et al. locate itraconazole, a low-soluble antifungal drug in porous SBA-15, which increased its release. Zelenak et al. stabilized two Zn3(benzoate)6(nicotinamide)2 ZnNIA and Zn (benzoate)2(3-pyridinemethanol)2]n(ZnPCB) antibacterial drug complexes on SBA-16 and examined their release (Zeleňák et al., 2005).
Other Silica Mesopores
TUD-1 is similar to foam because of its three-dimensional structure, where ibuprofen loading has led to improved drug release rates. Its synthesis conditions are slightly different from that of porous silica nanoparticles and the manufacturing process is carried out without the presence of surfactants, which is essential in terms of toxicity reduction and economic feasability. It has a high absorption capacity and is suitable for loading water-soluble drugs (). HMS has been reported as another meso-silica with a porous structure, the central part of which is hollow, which has given it the potential to load the drug as a nano-carrier (Zhu et al., 2005). The loading of ibuprofen and vancomycin by MCFs has been reported to have resulted in their dissolution rate increasing and as a good candidate for drug delivery (Zhu et al., 2009).
The incorporation of magnetic nanoparticles with mesoporous nanoparticles with a particle diameter of about 150 nm and pore size of 4 nm also showed slow drug release, similar to ibuprofen ().
Functionalization of Mesoporous Silica
Modification of the surface of the porous silica nanoparticles is carried out to enhance their different physical and chemical attributes. As mentioned, porous silica materials have an unusually broad surface area. Their surface is covered with silanol groups, which makes their cavities surface functional to be adjustable, which dramatically enhances the various physical and chemical properties (). For example, the mesoporous surface of the silica can be modified by sulfonic acid groups derived from oxidized mercapto. Modified mesosilica can also be obtained with the aldehyde functional group by reaction with the amine and glutaraldehyde functional groups. Therefore, the various groups are capable of generating internal reactions such as hydrogen bonding, electrostatic adsorption, and covalent bonding with host molecules. Also, an organoalkoxy silane can be replaced with the cyano group present in the mesoporous surface, and the modified groups in the presence of sulfuric acid as catalysts were variated through hydrolysis by acidic groups.
Post-synthesis Grafting
Grafting is a type of post-fabrication process used to modify the surface of pre-fabricated porous silica material which bonds the functional groups connected to their surface after removing the surfactant (Zhang et al., 2004; Lesaint et al., 2005). The abundant silanol groups present on the surface of the silica porous material are applied as suitable junctions for functionalization with organic functional groups (Figure 5) ().
FIGURE 5
After removal of the surfactant, the organosilanes can be attached to the silanol channels using trichloro organosilanes or trialkoxy organosilanes (). A series of organosilanes including amine (), thiol (Li et al., 2011), chloride (), cyano (Prouzet et al., 1999), ester (Prouzet et al., 1999), aldehyde (Yin et al., 2020), epoxy (Yeganeh et al., 2019), anhydride (Park et al., 2019), isocyanate (Ratirotjanakul et al., 2019), phosphor (Yamada et al., 2019), imidazole (Nuri et al., 2019), ammonium (Lagarde et al., 2019), acryl (Xiao Song et al., 2019), alkyl (Nuntang et al., 2019), and phenyl () are available for application in the grafting procedure. The grafting is done by silicification so that the reaction is carried out on free (Si-OH) and attached silanol (HO-Si-OH) groups (). To diversify the surface or cavity walls of silica nanoparticles, silanol groups bonded hydrogen have limited access because they form hydrophilic networks between themselves (). It is worth noting that the main structure of the mesoporous does not change after applying the grafting procedure (Zhang et al., 2004). Silica mesostructures have two inner and exterior parts. Functional groups on the outer part will be more accessible than the inner part but the presence of these patches will diminish the use of pores space (Lesaint et al., 2005). To minimize the barriers of the outer surface in reaction and selective optimization, the outer surfaces may be coated to reduce chemical reactions before the functionalization of the inner surfaces occurs (Zhang et al., 2004; Lesaint et al., 2005). It is also possible to modify the surface in a controlled manner through site-selective grafting methods. Thus, in the first step, the cavities are filled with surfactants, and the exterior modification is accomplished by the proximity of the template to a solution such as a trimethylsilyl chloride (Lesaint et al., 2005). Then, template and finally the interior pore surfaces, for example, are functionalized with the phenyl propyl dimethyl chlorosilane sample (Zhang et al., 2004).
Co-Condensation
The co-condensation matter is, in fact, sol-gel chemistry between tetraalkoxysilanes and one or more of the organoalkoxy silanes with Si-C bonds (). In its mechanism of operation, silica precursor with a organotrialkoxy silanes (R/(Si(OR)3) precursor in neutral, acidic media that the organosilane precursor plays two important roles in silica-based skeletal formation and binding of an organic group to the skeleton (). Due to the presence of organic groups in the synthesized nanoparticles, template removal should be performed under appropriate conditions in terms of temperature and pH (Wu et al., 2013). Template removal is generally preferred by chemical extraction, and depending on the nature of the template and the manufacturing process, chemical extraction of the surfactant molecules is carried out by refluxing with ethanol or ethanol/HCl under highly acidic H2SO4 conditions. Functional groups such as polypropylene glycol, trimethylbenzene and tetradecane can also be used to achieve modified ordered mesoporous (). One of the advantages of this method, compared to the post-synthesis grafting, is the applicability of a wide range of organoalkoxy silanes () suitable for a wide range of reaction conditions (), homogeneous coverage of functional groups (Putz et al., 2019), and high loading of functional groups without destructing the regular structure of the pores (Nguyen et al., 2019).
Silica Mesoporous for Drug Delivery
The use of nanosilica materials for controlled drug delivery and release has been reported since the beginning of 1983 (). To date, silica nanoparticles are widely used as drug carriers due to their easy compatibility and formulation with drugs (Yamada et al., 2019). Advantages of using mesoporous silica to transport bioactive molecules include protecting cargo from physiological destruction of controlled release of drugs (Tang et al., 2012), longer durability in the bloodstream (Privett et al., 2011), improving targeted drug delivery (Wang et al., 2010), and reducuction of side effects to healthy tissues (Zhou et al., 2017). In recently years, non-steroidal Analgesics (NSA) have been considered. Non-steroidal painkillers, which are analgesic (), fever-inducing (N et al., 2019), and platelet-inhibiting (), are one of the most widely used medical drugs whose biological target is the cyclooxygenase (COX) enzyme (Voiriot et al., 2019). These drugs actually suppress prostaglandins, which are chemical messengers for pain, fever, and inflammation (Mahalanobish et al., 2019). Their strategy of action is to inactivate the performance of the COX, which has the potential to convert fatty acid to prostaglandin, or in other words, overcome the production of prostaglandin by COX (). In addition to the advantages of these drugs, they have side effects, including excessive body retention (Marsh et al., 1972) and low solubility (Rives et al., 2013), which disrupt the treatment. As a result, in recent years, silica porous nanoparticles have been proposed to address these problems. Increasing the solubility of NSA drugs can be justified by the size of the cavities (Mellaerts et al., 2008), easy dispersion, indirect transfer of the drug into the aqueous media (Li et al., 2007), utilization of surfactants (), and long durability in the body by biodegradable coatings such as polyethylene glycol (PEG) (Morelli et al., 2011). Research has reported the release of a number of drugs such as ibuprofen (), diclofenac (), melasamine (Mes) (Tiwari et al., 2019), naproxen (), piroxicam (), celecoxib (Zhao et al., 2012) and mefenamic acid (Mustafa and Hodali, 2015) and etc.
Yoncheva et al. synthesized MCM-41/carbopol/indomethacine nanocarrier. They reported that this meso-carrier showed little cytotoxicity due to carbopol coating (Tzankov et al., 2013). Naproxen (Nap) is a potent Cox enzyme inhibitor that reduces prostaglandin production and exhibits analgesic and anti-inflammatory effects (Lejal et al., 2013). Therefore, Halamova et al. two mesostructures used amine- non-amine functionalized hexagonal MCM-41 to release Nap. Comparison of these two carriers showed that after 72 h, the efficiency of release of MCM-41/Nap was 95% and with MCM-41/amine/Nap 90%, respectively. Their groups’ research also showed that the release of the Nap using SBA-15 with a larger cavity size was less than MCM-41 with a smaller cavity size (). The preparation of SBA-15 decorated by glycidyl methacrylate (GMA) as nanocarrier for release of ibuprofen and Mes was carried out by Rehman and coworkers. Copper was modified with hydrophobic ligands to slow and adjust the release of the two drugs and increase the ibuprofen and Mes- SBA-15 interaction. The impact of pH in their research revealed interesting results. The in vitro release rate from the functionalized SBA-15 was slow in simulated gastric fluid where pH = 1.2 was less than 10% of Mes and ibuprofen was released in initial time 8 h, while comparatively high release rates were observed in simulated intestinal (pH = 6.8) and simulated body fluids (pH = 7.2) (Rehman et al., 2016).
Conclusion and Clinical Translation
MSNs are one-of-a-kind nanoparticles that combine the chemical and physical stability of silica with the potential of the mesoporous structure’s network of cavities. MSNs’ unique properties, such as pore-volume, their great loading capability, their controllable particle size and shape, and their high drug loading capacity, make them an excellent carrier for nano-drug delivery systems. MSNs can be anchored with many polymers, proteins, enzymes and due to their ease of functionalization, make them a good candidate for drug delivery applications.
Standardization of manufacturing techniques is vital for achieving reproducibility in MSN synthesis. It is also critical that the generated nanoparticles have the proper stability, dispersibility; and any surface functionalization method should be standardized before reaching the clinic. More importantly, additional MSN biodistribution studies on various animal models should be conducted to be certain of the MSNs’ ultimate fate. From a broad view, it is clear that significant progress has been made in the design and development of MSNs for biological applications. However, much more work needs to be done before clinical translation can be accomplished.
Based on their efficacy in clinical studies, silica nanoparticles are developing as a viable diagnostic and delivery platform, and might play a crucial role in the development of next-generation theranostics, nanovaccines, and formulations to orally transport peptides and proteins. However, establishing safety from chronic exposure, establishing long-term toxicological profiles from various routes of administration, investigating reliable scale-up methods, and synthesizing reproducible silica nanoparticles with minimal batch-to-batch variation, are all major obstacles that must be overcome before silica nanoparticles can be used in clinical trials. Furthermore, only solid silica nanoparticles with no or small pores have been clinically evaluated to date. These nanoparticles have a low cargo-loading capacity which is particularly problematic for nucleic-acid-based medicines.
Statements
Author contributions
KS: writing—original draft methodology, software, validation, formal analysis, data curation, visualization JS: writing—original draft methodology, software, validation, formal analysis, data curation. AT: writing—original draft methodology, software, validation, MZ: writing—original draft methodology, software, validation, formal analysis, visualization NC: conceptualization, methodology, software, validation, formal analysis, investigation, resources, data curation, writing—original draft, review and editing, visualization. GS: conceptualization, methodology, software, validation, formal analysis, investigation, resources, data curation, writing—original draft, review and editing, visualization, supervision, project administration.
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.
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.
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Summary
Keywords
mesoporous, silica, nanoparticles, properties, drug delivery
Citation
Kazemzadeh P, Sayadi K, Toolabi A, Sayadi J, Zeraati M, Chauhan NPS and Sargazi G (2022) Structure-Property Relationship for Different Mesoporous Silica Nanoparticles and its Drug Delivery Applications: A Review. Front. Chem. 10:823785. doi: 10.3389/fchem.2022.823785
Received
29 November 2021
Accepted
25 January 2022
Published
14 March 2022
Volume
10 - 2022
Edited by
Sudip Mukherjee, Rice University, United States
Reviewed by
Ravindra Pratap Singh, Indira Gandhi National Tribal University, India
Vijay Sagar Madamsetty, Mayo Clinic Florida, United States
Updates
Copyright
© 2022 Kazemzadeh, Sayadi, Toolabi, Sayadi, Zeraati, Chauhan and Sargazi.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Ghasem Sargazi, g.sargazi@gmail.com; Narendra Pal Singh Chauhan, narendrapalsingh14@gmail.com
This article was submitted to Nanoscience, a section of the journal Frontiers in Chemistry
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