Highly Selective Determination of Dopamine in the presence of Ascorbic Acid and Serotonin at Glassy Carbon Electrodes Modified with Carbon Nanotubes Dispersed in Polyethylenimine.

MARCELA C. RODRÍGUEZ; MARÍA D. RUBIANES; GUSTAVO A. RIVAS

American Scientific Publishers

Año: 2008 vol. 8 p. 6003 - 6003

font face="Arial" size="3"> We report the highly selective and sensitive voltammetric dopamine quantification in the presence of ascorbic acid and serotonin by using glassy carbon electrodes modified with a dispersion of multi-wall carbon nanotubes (MWCNT) in polyethylenimine, PEI (GCE/MWCNT-PEI) The electrocatalytic activity of the MWCNT deposited on the glassy carbon electrode has allowed an important decrease in the overvoltages for the oxidation of ascorbic acid and dopamine, making possible a clear definition of dopamine, serotonin and ascorbic acid oxidation processes. The sensitivities for dopamine in the presence and absence of 1.0 mM ascorbic acid and serotonin were (2.18 ± 0.03) x 105 ìAM-1 (r = 0.9998); and (2.10 ± 0.07) x 105 ìAM