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Effect of 3‐ O ‐Galloyl Substitution on the Electrochemical Oxidation of Quercetin and Silybin Galloyl Esters at Glassy Carbon Electrode
Author(s) -
Zatloukalová Martina,
Enache Teodor Adrian,
Křen Vladimír,
Ulrichová Jitka,
Vacek Jan,
OliveiraBrett Ana Maria
Publication year - 2013
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.201300102
Subject(s) - gallic acid , quercetin , chemistry , antioxidant , glassy carbon , cyclic voltammetry , electrochemistry , methyl gallate , differential pulse voltammetry , organic chemistry , medicinal chemistry , nuclear chemistry , electrode
Abstract The galloyl substitution effect on the antioxidant potential of quercetin‐3‐ O ‐gallate (QG) and silybin‐3‐ O ‐gallate (SBG), and the oxidation of QG and SBG were studied by cyclic, differential and square‐wave voltammetry using a glassy carbon electrode, and compared with their structural components, quercetin (Q), silybin (SB), gallic acid and gallic acid methyl ester. Their multi‐step pH‐dependent anodic behaviour, first oxidation followed by oxidation of the hydroxyl groups at ring A, is similar to Q and SB. The galloyl substitution significantly improved the antioxidant potential of SB compared to Q, and brought useful knowledge about the antioxidant activity of Q and SB monogalloyl esters.