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

被引：15
|
作者：
Zatloukalova, Martina [1 ,2 ]
Enache, Teodor Adrian [1 ]
Kren, Vladimir [3 ]
Ulrichova, Jitka [2 ]
Vacek, Jan [2 ]
Oliveira-Brett, Ana Maria [1 ]
机构：
[1] Univ Coimbra, Fac Sci & Technol, Dept Chem, P-3004535 Coimbra, Portugal
[2] Palacky Univ, Dept Med Chem & Biochem, Fac Med & Dent, Olomouc 77515, Czech Republic
[3] Acad Sci Czech Republ, Inst Microbiol, CR-14220 Prague, Czech Republic
来源：
ELECTROANALYSIS | 2013年 / 25卷 / 07期
关键词：
Galloylquercetin; Galloylsilybin; Flavonol; Flavonolignan; Glassy carbon electrode; Oxidation; ANTIOXIDANT CAPACITY; POLYPHENOLIC COMPOUNDS; CYCLIC VOLTAMMETRY; BEHAVIOR; RED; GREEN; ACID; WINE; DNA;
D O I：
10.1002/elan.201300102
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
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.
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页码：1621 / 1627
页数：7
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