Electrooxidation of flavonoids at platinum electrode studied by cyclic voltammetry

► The flavones were irreversibly oxidised at the platinum electrode. ► The first step includes the electrooxidation of hydroxyl groups in the ring B. Oxidation of one -OH group proceeds with an exchange of one electron. ► Hydroxyl groups in the rings A and C are probably oxidised in subsequent steps. ► If the number of -OH groups increases, a slower oxidation rate is observed.