The Process of Electrooxidation of Quercetin 3,4′-di-O-β-Glucopyranoside at Glassy Carbon Electrode

The present paper reports electrochemical and UV-VIS spectroscopic studies on the process of electrooxidation of quercetin 3,4'-di-O-beta-glucopyranoside (Q 3,4'-diglc) molecule, at glassy carbon electrode surface in 0.1 M sodium acetate acetic acid buffer in 90 % methanol solution. The process starts at 3'-OH group (ring B), followed by oxidation of 5,7-dihydroxyl group in ring A. As a result of electrochemical reactions, the surface area of glassy carbon (GC) electrode becomes extensively blocked by Q 3,4'-diglc oxidation products.