Carbon nanotubes paste electrodes modified with a melanic polymer: Analytical applications for the sensitive and selective quantification of dopamine

Rubianes, María Dolores
Arribas, Alberto Sánchez
Bermejo, Esperanza
Chicharro, Manuel
Zapardiel, Antonio
Rivas, Gustavo Adolfo

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Publication date

January 2010

DOI

10.1016/j.snb.2009.10.067

Publisher

Elsevier BV

ISSN

0925-4005

Journal

Sensors and Actuators B Chemical

Citation count (estimate)

Abstract

This work describes the advantages of carbon nanotubes paste electrodes (CNTPE) modified with a melanic polymer for the highly sensitive and selective quantification of dopamine. The polymer is electrogenerated from a 3.0 × 10-3 M l-dopa solution (in a 0.050 M phosphate buffer pH 7.40) by applying 0.80 V for 120 min. Two strategies for dopamine quantification are described, the amperometric detection at 0.200 V using 1.0 × 10-3 M ascorbic acid in the measurement solution to improve the sensitivity of the assay; and the adsorptive stripping detection with medium exchange using differential pulse voltammetry (DPV) as transduction mode. Detection limits of 2.0 nM and 20 nM were obtained with amperometry and adsorptive stripping, respectively. ...

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Carbon nanotubes paste electrodes modified with a melanic polymer: Analytical applications for the sensitive and selective quantification of dopamine

Abstract

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Carbon nanotubes paste electrodes modified with a melanic polymer: Analytical applications for the sensitive and selective quantification of dopamine

Abstract

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