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- Title
Effect of 3- O-Galloyl Substitution on the Electrochemical Oxidation of Quercetin and Silybin Galloyl Esters at Glassy Carbon Electrode.
- Authors
Zatloukalová, Martina; Enache, Teodor Adrian; Křen, Vladimír; Ulrichová, Jitka; Vacek, Jan; Oliveira‐Brett, Ana Maria
- 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.
- Subjects
ANTIOXIDANTS; QUERCETIN; GALLATES; OXIDATION; GALLIC acid
- Publication
Electroanalysis, 2013, Vol 25, Issue 7, p1621
- ISSN
1040-0397
- Publication type
Article
- DOI
10.1002/elan.201300102