Abstract

A novel Eastman-AQ/Ni II chemically modified electrode (CME) produced by “double coating step” deposition of a poly(ester sulphonic acid) polymer film and Ni 2+-containing crystalline species onto glassy carbon instead of a metallic nickel electrode exhibited stable electrocatalytic oxidation of numerous a-hydrogen compounds including carbohydrates, amines and amino acids. In cyclic voltammetry, the electrocatalysis appeared with an irreversible anodic wave at + 0.55 V (vs. Ag/AgCl). The CME was adapted for constant-potential amperometric detection of these compounds in flow injection analysis. Using the CME, the linear response concentration range was between 1.0 × 10 −5 and 5.0 × 10 −2 mol/1 and the detection limit was 5.0 × 10 −6 mol/1 for glucose. The stability of the CME was adequate for routine quantitative application.

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