ELECTROCATALYSIS OF NADH OXIDATION WITH ELECTROPOLYMERIZED FILMS OF AZURE-I

A stable electroactive thin film of poly(azure I) (PAI) was deposited on the surface of a glassy carbon electrode by cyclic voltammetry from azure I (AI) in an aqueous solution. Cyclic voltammograms of PAI indi cate the presence of two redox couples and the formal potentials of bo th shift Linearly towards the negative direction with increasing solut ion pH. The PAI-modified glassy carbon electrode shows excellent elect rocatalytic activity toward NADH oxidation in phosphate buffer solutio n (pH 7.0), with an overpotential of more than 460 mV lower than that of the bare electrode. The catalytic rate constant of the modified gla ssy carbon electrode for the oxidation of NADH is determined by cyclic voltammetry and rotating disk electrode measurements. (C) 1997 Elsevi er Science S.A.