Work

Evaluation of Polyphenols in Wine by Voltammetric Techniques with Screen Printed Carbon Electrodes

Year: 2019

Type: article

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 Na2CO3 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.

Source: Electroanalysis

DOI: 10.1002/elan.201900392

Authors: Pedro Rocha, Ângela Vilas‐Boas, Natacha Fontes, Dulce Geraldo, Fátima Bento

Institutions: University of Minho, Sogrape Vinhos (Portugal), Centro de Química

Language: English

Topic: Electrochemical sensors and biosensors

Subfield: Analytical Chemistry

Field: Chemistry

Domain: Physical Sciences

Open Access status: green

Funder: Fundação para a Ciência e a Tecnologia

Awards: G5984108682, G6916898079