Electrocatalytic Oxidation of Some Carbohydrates by Nickel/Poly( o ‐Aminophenol) Modified Carbon Paste Electrode

This study investigates the electrocatalytic oxidation of glucose and some other carbohydrates on nickel/poly( o ‐aminophenol) modified carbon paste electrode as an enzyme free electrode in alkaline solution. Poly( o ‐aminophenol) was prepared by electropolymerization using a carbon paste electrode bulk modified with o ‐aminophenol and continuous cyclic voltammetry in HClO 4 solution. Then Ni(II) ions were incorporated to electrode by immersion of the polymeric modified electrode having amine group in 1 M Ni(II) ion solution. Cyclic voltammetric and chronoamperometric experiments were used for the electrochemical study of this modified electrode; a good redox behavior of Ni(OH) 2 /NiOOH couple at the surface of electrode can be observed, the capability of this modified electrode for catalytic oxidation of glucose and other carbohydrates was demonstrated. The amount of α and surface coverage ( Γ *) of the redox species and catalytic chemical reaction rate constant ( k ) for each carbohydrate were calculated. Also, the electrocatalytic oxidation peak currents of all tested carbohydrates exhibit a good linear dependence on concentration and their quantification can be done easily.