INDIRECT ELECTROCATALYTIC OXIDATION OF STARCH BY REACTIVE OXYGEN SPECIES IN SITU GENER-ATED ON Pb/PbO2 ANODE AND BORON-DOPED DIAMOND ELECTRODE IN AQUEOUS ELECTROLYTES
UDC 541.135:547.0
Abstract
The indirect electrocatalytic oxidation of starch by reactive oxygen species (ROS) generated in situ on lead dioxide anodes and a boron-doped diamond electrode in an acidic aqueous electrolyte has been studied. The influence of the current density, concentration and state of aggregation of the reagent, the scheme of introduction of ROS on the kinetics and yields of the product of indirect oxidation of starch dialdehyde karazmal has been established. The optimal conditions for obtaining oxidized starch were determined: anode – Pb/PbO2, current density – 25 mA/cm-2, electrolyte pH 2–3, electrolysis time – 80 min, 25 °C. Starch oxidation products were analyzed by the following methods: spectrophotometry after deratization with dinitrophenylidrazine, gas chromatography-mass spectrometry after hydrolysis and silylation, and IR spectroscopy. Glucose tautomers, as well as ethylene glycol oligomers, were found in the hydrolyzates of the reaction products by GCMS, indicating the breaking of C-C bonds in the monosaccharide units during the oxidation process.
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