Electrocatalytic oxidation of some carbohydrates by poly(1-naphthylamine)/nickel modified carbon paste electrode

A method of generating a rapidly renewable and reproducible polymer coated electrode surface is proposed. This involves in situ electropolymerization at a monomer modified carbon paste electrode. A carbon paste electrode bulk modified with 1-naphthylamine was used to demonstrate this approach. Then Ni(II) ions were incorporated by immersion of the modified electrode in a 0.1 M Ni(II) ion solution. The electrochemical characterization of this modified electrode exhibits stable redox behavior of the Ni(III)/Ni(II) couple even after potential 500 cycles. Also, cyclic voltammetric and chronoamperometric experiments showed that glucose was oxidized at the surface of this Ni(II) dispersed polymeric modified carbon paste electrode. The electrode was successfully used in the electrocatalytic oxidation of various other carbohydrates. Finally, the electrocatalytic oxidation peak currents of all carbohydrates tested exhibited a good linear dependence on concentration and their quantification can be done easily. (C) 2004 Elsevier B.V. All rights reserved.