Effect of 3-O-Galloyl Substitution on the Electrochemical Oxidation of Quercetin and Silybin Galloyl Esters at Glassy Carbon Electrode

0423350 - MBÚ 2014 RIV DE eng J - Článek v odborném periodiku
Zatloukalová, M. - Enache, T. A. - Křen, Vladimír - Ulrichová, J. - Vacek, J. - Oliveira-Brett, A.M.
Effect of 3-O-Galloyl Substitution on the Electrochemical Oxidation of Quercetin and Silybin Galloyl Esters at Glassy Carbon Electrode.
Electroanalysis. Roč. 25, č. 7 (2013), s. 1621-1627. ISSN 1040-0397. E-ISSN 1521-4109
Grant CEP: GA ČR(CZ) GAP301/11/0767
Institucionální podpora: RVO:61388971
Klíčová slova: Galloylquercetin * Galloylsilybin * Flavonol
Kód oboru RIV: CC - Organická chemie
Impakt faktor: 2.502, rok: 2013

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 ringA, 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
Trvalý link: http://hdl.handle.net/11104/0229558