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Type: Artigo de periódico
Title: Electrochemical behavior of dopamine at a 3,3 '-dithiodipropionic acid self-assembled monolayers
Author: Codognoto, L
Winter, E
Paschoal, JAR
Suffredini, HB
Cabral, MF
Machado, SAS
Rath, S
Abstract: Monolayers of 3,3'-dithiodipropionic acid (DTDPA) were prepared on a polycrystalline gold electrode through a self-assembly procedure to produce a gold 3,3'-dithiodipropionic acid self-assembled monolayer (AuDTDPA) modified electrode. The characterization of the AuDTDPA electrode was investigated by cyclic voltammetry and ac impedance using the [Fe(CN)(6)](3-/4-) redox couple. The electrochemical behavior of DA on the modified electrode AuDTDPA was studied by cyclic and square-wave voltammetries, using phosphate buffer as supporting electrolyte. The oxidation peak current for DA increases linearly with concentration in the range of 0.35 x 10(-5) to 3.4 x 10(-5) mol L-1. The performance of the AuDTDPA modified electrode was evaluated for the electroanalytical determination of dopamine (DA) in a pharmaceutical formulation. The AuDTDPA modified electrode showed a stable behavior and the presence of surface-COOH groups avoided the passivation of the electrode surface during the dopamine oxidation. (c) 2006 Elsevier B.V. All rights reserved.
Subject: self-assembled monolayers
3,3 '-dithiodipropionic acid
square-wave voltammetry
gold electrode
Country: Holanda
Editor: Elsevier Science Bv
Citation: Talanta. Elsevier Science Bv, v. 72, n. 2, n. 427, n. 433, 2007.
Rights: fechado
Identifier DOI: 10.1016/j.talanta.2006.10.045
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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