Collect. Czech. Chem. Commun.
2010, 75, 547-561
https://doi.org/10.1135/cccc2009548
Published online 2010-05-17 12:36:05
Electrochemical and antioxidant properties of rutin
Martina Medvidović-Kosanovića,*, Marijan Šerugab, Lidija Jakobekb and Ivana Novakb
a Department of Chemistry, J. J. Strossmayer University, F. Kuhača 20, HR-31000 Osijek, Croatia
b Faculty of Food Technology, J. J. Strossmayer University, F. Kuhača 18, HR-31000 Osijek, Croatia
Abstract
The mechanism of electrochemical oxidation of rutin on a glassy carbon electrode was studied at different pH by using several electrochemical techniques (cyclic, linear sweep, differential pulse and square-wave voltammetry) in order to give deeper insight into the mechanism of electrochemical oxidation of rutin and adsorption of its oxidation products on a glassy carbon electrode. It was determined that the rutin oxidation process on a glassy carbon electrode is reversible, pH dependent and includes the transfer of 2 e– and 2 H+. The products of electrochemical oxidation strongly adsorb on the electrode surface. Maximum surface coverage, Γmax, decreased with increasing scan rate from 3.4 × 10–9 mol cm–2 at scan rate 20 mV s–1 to 1.5 × 10–9 mol cm–2 at scan rate 100 mV s–1 and adsorption equilibrium constant was log K = 4.57 ± 0.05. Antioxidant properties of rutin were investigated by a Trolox equivalent antioxidant capacity (TEAC) assay. It was found that the TEAC values of rutin depend on concentration and the EC50 value of rutin amounted 0.23.
Keywords: Polyphenols; Antioxidants; Rutin; Electrochemistry; Oxidation; Adsorption; Antioxidant properties; TEAC assay; Differential pulse; Square-wave voltammetry.
References: 37 live references.
