Abstract

In a previous paper, we revealed a different way to modify multi walled carbon nanotubes (MWCNTs) with 3,5-dinitrobenzoic acid (35DNB) wherein the compound is entrapped on the electrode without covalent bond between 35DNB and the MWCNT array. Later [2] we proved that 35DNBMWCNTGC electrode efficiently catalyzed the oxidation of NADH. With the aim of obtaining a stronger bond of the electrocatalytic mediator 35DNB with the MWCNTs we have synthesized a modified compound of 35DNB. The modification consisted in adding a 4- (piren-1-yl) butyl terminal to 35DNB to form 4- (pyren-1-yl) butyl-3,5-dinitrobenzoate (35DNBpy). The electro-oxidation of NADH has always been a challenge, because it occurs in common electrodes irreversibly and with high overpotential. In this work, the electrocatalytic effect of new modified electrodes with MWCNTs and 35DNBpy is reported. The electrocatalytic effect was evaluated by cyclic voltammetry.