Electrocatalytic oxidation of uric acid at an electrodeposited redox polymer film-modified gold electrode

A hydrated osmium complex-containing redox polymer film-modified gold electrode based on electrochemical cross-linking was developed. The amount and the characteristics of redox polymer film cross-linked on the gold electrode were investigated by using electrochemical quartz crystal microbalance (EQCM). The redox polymer film exhibited a strong electrocatalytic activity toward the oxidation of uric acid with a lowering of the overpotential by about 230 mV and a large increase in the magnitude of the oxidation peak current. Based on this procedure, an amperometric method for the determination of uric acid concentration was proposed.