Electrocatalytic Oxidation of Ascorbic Acid on Carbon Paste Electrode Modified with [Ru(EDTA)(4PMC)]

Abstract

Abstract-In this work the polymer 4-pyridilmethylchitosan/Ru(EDTA) ([Ru(EDTA)(4PMC)]) was used as modifier in the preparation of chemically modified carbon paste electrodes. The electrochemical behavior of the polymer compound is governed by the a conversion of the monossubstituted species for disubstituted species when the reduction of Ru ffl to Ru 11 occurs. The cyclic voltammogram of the electrode prepared with the [Ru(EDTA)(4PMC)] in the presence of ascorbic acid presented an increment in the anodic peak current in 0,38 V, which indicates that the catalysis of ascorbic acid oxidation is mediated by polymer.