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

FAUSTO N. COMBA; FABIANA A. GUTIERREZ; PILAR HERRASTI; MARÍA D. RUBIANES; GUSTAVO A. RIVAS

ELECTROANALYSIS

WILEY-V C H VERLAG GMBH

Lugar: Weinheim; Año: 2012 vol. 24 p. 1541 - 1546

1040-0397

This work reports the effect of the incorporation of different proteins within carbon paste electrodes (CPE) modi- fied with electrochemically synthesized magnetite nanoparticles (20 nm) on the electrochemical response towards hydrogen peroxide. Scanning electron microscopy images reveal that the proteins produce a more efficient disper- sion of the nanoparticles within the composite. When CPE is modified with 5.0% w/w magnetite and 5.0% w/w al- bumin the sensitivity for hydrogen peroxide at 0.100 V is enhanced 40 times and the charge transfer resistance sig- nificantly decreases. The increase in sensitivity and the decrease in Rct was dependent on the nature of the protein.