Journal
FOOD CHEMISTRY
Volume 211, Issue -, Pages 1-7Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2016.05.020
Keywords
Oxidation; Quinones; Thiols; Amino acids; Antioxidants; Wine; Cyclic voltammetry; Phenolics
Funding
- FCT/MEC - FEDER [FCT UID/QUI/00062/2013]
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Quinones are electrophilic species which can react with various nucleophiles, like wine antioxidants, such as sulfur dioxide or ascorbic acid, thiols, amino acids, and numerous polyphenols. These reactions are very important in wine aging because they mediate oxygen reactions during both production and bottle aging phases. In this work, the major challenge was to determine the interaction between orthoquinones and wine nucleophiles (amino acids, thiols, and the antioxidants SO2 and ascorbic acid), by cyclic voltammetry. Wine-model solutions with gallic acid, caffeic acid, or (+)-catechin and nucleophilic compounds were used. To understand the effect of nucleophilic addition in wine, a white wine with the same added nucleophiles was also analysed. Cyclic voltammograms were taken with glassy carbon electrode or screen-printed carbon electrodes, respectively, for wine-model and white wines solutions, in the absence and in the presence of nucleophiles. A nucleophilic order profile related to the cathodic current intensity decrease was observed. (C) 2016 Elsevier Ltd. All rights reserved.
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