Graphene Paste Electrode: Analytical Applications for the Quantification of Dopamine, Phenolic Compounds and Ethanol

FABIANA GUTIERREZ; FAUSTO N. COMBA; AURÉLIEN GASNIER; ALEJANDRO GUTIERREZ; LAURA GALICIA; CONCEPCIÓN PARRADO; MARÍA D. RUBIANES; GUSTAVO A. RIVAS

ELECTROANALYSIS

WILEY-V C H VERLAG GMBH

Lugar: Weinheim; Año: 2014 vol. 26 p. 1694 - 1701

1040-0397

This work reports the analytical applications ofa graphene paste electrode (GrPE) for the quantificationof dopamine, ethanol and phenolic compounds. Dopaminewas detected by differential pulse voltammetry-adsorptivestripping with medium exchange at submicromolarlevels even in the presence of high excess of ascorbicacid and serotonin. The electrocatalytic activity of graphenetowards the oxidation of NADH and the reductionof quinones allowed the sensitive amperometric determinationof ethanol and phenols using GrPE modified withalcohol dehydrogenase/NAD+ or polyphenol oxidase, respectively,with successful applications in real sampleslike alcoholic beverages and tea.