Document Detail


Electrochemical behavior of dopamine at a 3,3'-dithiodipropionic acid self-assembled monolayers.
MedLine Citation:
PMID:  19071635     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
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 0.35x10(-5) to 3.4x10(-5)molL(-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.
Authors:
Lucia Codognoto; Eduardo Winter; Jonas A R Paschoal; Hugo B Suffredini; Murilo F Cabral; Sergio A S Machado; Susanne Rath
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Publication Detail:
Type:  Journal Article     Date:  2006-11-28
Journal Detail:
Title:  Talanta     Volume:  72     ISSN:  1873-3573     ISO Abbreviation:  Talanta     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2008-12-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984816R     Medline TA:  Talanta     Country:  England    
Other Details:
Languages:  eng     Pagination:  427-33     Citation Subset:  -    
Affiliation:
Institute of Chemistry, Department of Analytical Chemistry, State University of Campinas, P.O. Box 6154, 13084-971 Campinas, SP, Brazil.
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