Voltammetric electronic tongue to identify Brett character in wines. On-site quantification of its ethylphenol metabolites
González-Calabuig, Andreu (Universitat Autònoma de Barcelona. Departament de Química)
Valle Zafra, Manuel del (Universitat Autònoma de Barcelona. Departament de Química)

Data:	2018
Resum:	This work reports the applicability of a voltammetric sensor array able to evaluate the content of the metabolites of the Brett defect: 4-ethylphenol, 4-ethylguaiacol and 4-ethylcatechol in spiked wine samples using the electronic tongue (ET) principles. The ET used cyclic voltammetry signals, obtained from an array of six graphite epoxy modified composite electrodes; these were compressed using Discrete Wavelet transform while chemometric tools, among these artificial neural networks (ANNs), were employed to build the quantitative prediction model. In this manner, a set of standards based on a modified full factorial design and ranging from 0 to 25 mg L−1 on each phenol, was prepared to build the model; afterwards, the model was validated with an external test set. The model successfully predicted the concentration of the three considered phenols with a normalized root mean square error of 0. 02 and 0. 05, for the training and test subsets respectively, and correlation coefficients better than 0. 958.
Ajuts:	Ministerio de Economía y Competitividad CTQ2013-41577-P
Nota:	Altres ajuts: Andreu González-Calabuig thanks Universtitat Autònoma de Barcelona for the PIF fellowship. Manel del Valle thanks the support from program ICREA Academia.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Matèria:	Artificial neural networks ; Brettanomyces defect ; Electronic tongue ; Phenolic defects ; Wine
Publicat a:	Talanta, Vol. 179 (March 2018) , p. 70-74, ISSN 1873-3573

DOI: 10.1016/j.talanta.2017.10.041

Preprint 15 p, 1.5 MB

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