Effect of the Incorporation of Proteins on the Performance of Carbon Paste Electrodes Modified with Electrogenerated Magnetite Nanoparticles towards the Reduction of Hydrogen Peroxide

Abstract

This work reports the effect of the incorporation of different proteins within carbon paste electrodes (CPE) modified with electrochemically synthesized magnetite nanoparticles (20nm) on the electrochemical response towards hydrogen peroxide. Scanning electron microscopy images reveal that the proteins produce a more efficient dispersion of the nanoparticles within the composite. When CPE is modified with 5.0% w/w magnetite and 5.0% w/w albumin the sensitivity for hydrogen peroxide at -0.100V is enhanced 40 times and the charge transfer resistance significantly decreases. The increase in sensitivity and the decrease in Rct was dependent on the nature of the protein. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.