PREPARATION AND PROPERTIES OF POLYBENZIDINE FILM-COATED ELECTRODE AS AN H2O2 SELECTIVE POLYMERIC MATERIAL

By means of electrochemical polymerization, polybenzidine-modified ele ctrodes were prepared in an aqueous monomer solution at a potential of 0.7 V versus Ag/AgCl. The permselective character of the polybenzidin e electrode prepared in a one-step procedure was examined for electroa ctive (ascorbic acid, oxalic acid, and hydrogen peroxide) and nonelect roactive (lactose, sucrose, and urea) species. Influence of the variou s parameters on the permselective properties of the polybenzidine memb rane was systematically investigated and the optimal values for these parameters were determined. It has been found that polybenzidine membr ane showed selective permeation for hydrogen peroxide while blocking t he permeation of electroactive and nonelectroactive interferents throu gh film. In brief, it is claimed that this polybenzidine film can be u sed as a coating material to prevent interferences in electrochemical biosensor applications. (C) 1998 John Wiley & Sons, Inc.