Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 706, Issue -, Pages 69-75Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2013.07.037
Keywords
Dopamine; Ascorbic acid; Uric acid; Gold nanoparticles; ITO
Categories
Funding
- CONACyT [267687, 80305, 82932]
- ICyTDF [ICyTDF/327/2011]
- SNI
- Departamento de Materiales at UAM-A [DM.AIM.01-07]
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An indium tin oxide (ITO) electrode modified with gold nanoparticles, having a mean particle diameter of (19.3 +/- 1.2) nm, ITO-AuNPs, was used in this work to carry out the determination of dopamine, DA, by means of differential pulse voltammetry, in the presence of a high concentration of two of its main interfering agents: ascorbic, AA, and uric, UA, acids. Both the latter components impair the neurotransmitter's detection and its subsequent quantification by electrochemical means, due to inherently overlapping oxidation potentials with respect to DA. This constitutes the main impediment towards achieving a successful, electrochemically simple and affordable quantification method. From the analysis of the oxidation peaks' currents, relevant analytical parameters, for the ITO-AuNPs electrode towards DA quantification, were obtained as follows: a) in the absence of AA and UA a detection limit of (34.97 +/- 0.08) mu M with a sensitivity of (10.10 +/- 0.08) mu A mM(-1)b) in the presence of AA and UA a detection limit of (34.50 +/- 0.07) mu M with a sensitivity of (17.62 +/- 0.15) mu A mM(-1). (C) 2013 Elsevier B.V. All rights reserved.
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