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. RODRIGUEZ; MARÍA D. RUBIANES; GUSTAVO A. RIVAS.

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY

American Scientific Publishers

Año: 2008 vol. 8 p. 6003 - 6003

1533-4880

span style="LINE-HEIGHT: 200%; FONT-FAMILY: Arial; FONT-SIZE: 12pt" lang="en"> 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