In order to elucidate the mechanism of the flavonoid taxifolin (dihydroquercetin) oxidation under the electrochemical experiment conditions in the aqueous solutions the chronoamperometry and bulk electrolysis with following characterization of the oxidation products by means of the HPLC with both UV-vis and MS detection have been coupled. The taxifolin diffusion coefficient has been evaluated in the aqueous solution as 3.63 x 10(-6) cm(2)/s. The experimentally obtained number of electrons per one taxifolin molecule falls between 2 and 3 demonstrating that under electrochemical oxidation conditions only part of initially oxidized taxifolin molecules participates in dimerization and further transformation. (C) 2018 Elsevier Ltd. All rights reserved.