Resumen:
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The results presented here demonstrate the important catalytic effect of a carbon paste electrode modified by
dispersion of gold nanoparticles towards different electroactive compounds. The oxidation of hydrogen peroxide
starts at potentials 400 mV less positive than at bare carbon paste, while the reduction, almost negligible at bare
carbon paste, starts at 0.100 V. The influence of the size and amount of gold nanoparticles in the composite matrix on
the response of the electrode is discussed. The incorporation of albumin within the carbon paste facilitates the
dispersion of gold nanoparticles, improving substantially the catalytic effects. At carbon paste modified with gold
nanoparticles and albumin, the peak potential separation for hydroquinone decreases from 0.385 V to 0.209 V while
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