Square-Wave and Cyclic Voltammetry of Native Proanthocyanidins Extracted from Grapevine (Vitis vinifera) on the Glassy Carbon Electrode

Condensed tannins are short polymers of flavan-3-ols found in grapes (also known as proanthocyanidins). An investigation on the electrochemical oxidation grapevine proanthocyanidins (PAs) glassy carbon electrodes under various conditions was conducted for first time. To study how were oxidized, square-wave and cyclic voltammetry used. There is a predominant peak associated with extract proanthocyanidins, this can be attributed to catechol 3′,4′-dihydroxyl groups, which form their peak. two electrons protons involved group, must kept mind when considering group. On electrode (GCE), PAs extracted from oxidized by an adsorption-dependent mechanism they interact GCE surface. As result, it that anodic current varied linearly PAs’ concentrations range 4 50 ppm, detection limit 3.07 ppm (S/N = 3). development surface concentration products at GC electrode; scans progressed, remained 4.83 × 10−11 mol cm−2, indicating immobilized adsorbed electrode.