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Evaluation of Polyphenols in Wine by Voltammetric Techniques with Screen Printed Carbon Electrodes
Author(s) -
Rocha Pedro,
VilasBoas Ângela,
Fontes Natacha,
Geraldo Dulce,
Bento Fátima
Publication year - 2020
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201900392
Subject(s) - wine , glassy carbon , electrochemistry , polishing , electrode , materials science , carbon fibers , polyphenol , chemistry , cyclic voltammetry , metallurgy , composite material , organic chemistry , food science , composite number , antioxidant
Abstract The electrochemical oxidation processes that occur during a voltammetric assay in wine samples lead to the formation of species that obstructs the surface and reduce their active area. This effect is critical for screen printed carbon electrodes (SPCE) and leads to abnormal low values of the total polyphenols content of wines, ca. 72 % lower than those obtained with glassy carbon electrodes. This effect was examined using 10 red and Port wine samples. Mechanical polishing and electrochemical‐based treatments for the removal of this fouling layer were tested. The best results were obtained by electrochemical activation in at a constant potential of 1.2 V during 100 s Na 2 CO 3 saturated solution, and by polishing. The success of some of these treatments brings an added value to SPCE, as it opens the possibility of their reuse in the wine analysis. This outcome is particularly relevant for quality control where a huge number of analysis is performed and the reduction of cost may dictates the choice of the analytical method.