Document Detail


Efficient electrocatalysis of L-cysteine oxidation at carbon ionic liquid electrode.
MedLine Citation:
PMID:  17716615     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The electrochemistry of L-cysteine (CySH) in neutral aqueous media was investigated using carbon ionic liquid electrode (CILE). Comparative experiments were carried out using glassy carbon electrodes. At CILE, highly reproducible and well-defined cyclic voltammograms were obtained for l-cysteine with a peak potential of 0.49V vs Ag/AgCl, showing that CILE manifests a good electrocatalytic activity toward oxidation of l-cysteine. A linear dynamic range of 2-210microM with an experimental detection limit of 2microM was obtained. The method was successfully applied to the determination of l-cysteine in a sample of soya milk. Cysteine oxidation at CILE does not result in deactivation of the electrode surface. Mechanistic studies showed that, at CILE, the overall CySH oxidation is controlled by the oxidation of the CyS(-) electroactive species.
Authors:
N Maleki; A Safavi; F Sedaghati; F Tajabadi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-04-25
Journal Detail:
Title:  Analytical biochemistry     Volume:  369     ISSN:  0003-2697     ISO Abbreviation:  Anal. Biochem.     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2007-09-10     Completed Date:  2007-11-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370535     Medline TA:  Anal Biochem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  149-53     Citation Subset:  IM    
Affiliation:
Department of Chemistry, College of Sciences, Shiraz University, Shiraz, Fars 71454, Iran.
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MeSH Terms
Descriptor/Qualifier:
Biosensing Techniques / instrumentation,  methods*
Carbon / chemistry*
Catalysis
Cysteine / analysis*
Electrodes
Ionic Liquids / chemistry*
Milk Proteins / chemistry
Oxidation-Reduction
Potentiometry
Reproducibility of Results
Sensitivity and Specificity
Soybeans / chemistry*
Chemical
Reg. No./Substance:
0/Ionic Liquids; 0/Milk Proteins; 52-90-4/Cysteine; 7440-44-0/Carbon

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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