Electrocatalytic oxidation and sensitive determination of glycine at poly(niIIteta) modified electrodes

Abstract

A new electrocatalyst for the electrocatalytic oxidation of glycine (Gly) is reported. A Glassy carbon electrode (GC) was modified with conductive film of polymeric [NiII(teta)]2+ (represented as GC/poly(Ni); teta = C-meso-5,5,7,12,12,14-hexamethyl-1,4,8,11-tetra-azacyclotetradecane) and used for the electrocatalytic oxidation and sensitive determination of Gly. Cyclic voltammetry and electrochemical impedance studies of the GC/poly(Ni) electrode show improved kinetics for the oxidation of Gly. The catalytic current at the GC/poly(Ni) electrode in presence of different concentrations of Gly is linear in the range 10.0 μM to 5.0 mM with two different slopes. The catalytic oxidation rate constant and diffusion coefficient of Gly are determined using chronoamperometry and chronocoulometry. © 2013 American Scientific Publishers.