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Front. Chem. | doi: 10.3389/fchem.2018.00131

Monitoring the phenolic ripening of red grapes using a multisensor system based on metal-oxide nanoparticles

 Celia García-Hernández1, Cristina Medina-Plaza1, Cristina Garcia-Cabezon1, Yolanda Blanco1, Jose Antonio Fernandez-Escudero2,  Enrique Barajas-Tola2,  MIGUEL A. RODRIGUEZ-PEREZ1, Fernando Martin-Pedrosa1 and  Maria Luz Rodriguez-Mendez1*
  • 1University of Valladolid, Spain
  • 2Instituto Tecnológico Agrario de Castilla y León, Spain

The maturity of grapes is usually monitored by means of the sugar content. However, the assessment of other parameters such as the phenolic content is also important because the phenolic maturity has an important impact on the organoleptic characteristics of wines. In this work, voltammetric sensors able to detect the phenolic content of red grapes have been developed. They are based on metal oxide nanoparticles (CeO2, NiO and TiO2,) whose excellent electrocatalytic properties towards phenols allows obtaining sensors with detection limits in the range of 10-8 M and coefficients of variation lower than 7%. An electronic tongue constructed using a combination of the nanoparticle-based sensors is capable to monitor the phenolic maturity of red grapes from véraison to maturity. An advantage of this system is that the electronic tongue can be used for the simultaneous assessment of the total phenolic index, the sugar content and the acidity. Thus, the electronic tongue based on metal oxide nanoparticles can be a valuable tool to monitor the ripeness process.

Keywords: ELECTRONIC TONGUE, Grape, ripening, Phenolic maturity, Metal oxide nanoparticles

Received: 23 Jan 2018; Accepted: 09 Apr 2018.

Edited by:

Larisa Lvova, Università degli Studi di Roma Tor Vergata, Italy

Reviewed by:

Prathik Roy, University of Canterbury, New Zealand
Cecilia Jimenez-Jorquera, Consejo Superior de Investigaciones Científicas (CSIC), Spain
Nicole J. Jaffrezic-Renault, Claude Bernard University Lyon 1, France  

Copyright: © 2018 García-Hernández, Medina-Plaza, Garcia-Cabezon, Blanco, Fernandez-Escudero, Barajas-Tola, RODRIGUEZ-PEREZ, Martin-Pedrosa and Rodriguez-Mendez. 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 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: Prof. Maria Luz Rodriguez-Mendez, University of Valladolid, Valladolid, Spain, mluz@eii.uva.es