Electrochemical behaviour of dopamine at covalent modified glassy carbon electrode with l-cysteine: preliminary results

Detalhes bibliográficos
Autor(a) principal: Martínez-Huitle,Carlos Alberto
Data de Publicação: 2009
Outros Autores: Cerro-Lopez,Monica, Quiroz,Marco Antonio
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Materials research (São Carlos. Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392009000400002
Resumo: The surface of glassy carbon (GC) electrode has been modified by oxidation of L-cysteine. The covalent modified GC electrode with L-Cysteine has been studied, according the supporting electrolyte used. Favourable interactions between the L-cysteine film and DA enhance the current response compared to that at the Nafion GC and bare GC electrodes, achieving better performances than those other electrodes. This behaviour was as result of the adsorption of the cysteine layer film, compact and uniform formation; depending on L-cysteine solution (phosphate buffer or chloridric acid supporting electrolyte) used for modifying GC surface. In cyclic voltammetric measurements, modified electrodes can successfully separate the oxidation/reduction DA peaks in different buffer solutions, but an evident dependence in the response was obtained as function of pH and modified electrode. The modified electrode prepared with L-cysteine/HCl solution was used to obtain the calibration curve and it exhibited a stable and sensitive response to DA. The results are described and discussed in the light of the existing literature.
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spelling Electrochemical behaviour of dopamine at covalent modified glassy carbon electrode with l-cysteine: preliminary resultsdopamineglassy carbon electrodecyclic voltammetrymodified electrodeL-CysteineThe surface of glassy carbon (GC) electrode has been modified by oxidation of L-cysteine. The covalent modified GC electrode with L-Cysteine has been studied, according the supporting electrolyte used. Favourable interactions between the L-cysteine film and DA enhance the current response compared to that at the Nafion GC and bare GC electrodes, achieving better performances than those other electrodes. This behaviour was as result of the adsorption of the cysteine layer film, compact and uniform formation; depending on L-cysteine solution (phosphate buffer or chloridric acid supporting electrolyte) used for modifying GC surface. In cyclic voltammetric measurements, modified electrodes can successfully separate the oxidation/reduction DA peaks in different buffer solutions, but an evident dependence in the response was obtained as function of pH and modified electrode. The modified electrode prepared with L-cysteine/HCl solution was used to obtain the calibration curve and it exhibited a stable and sensitive response to DA. The results are described and discussed in the light of the existing literature.ABM, ABC, ABPol2009-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392009000400002Materials Research v.12 n.4 2009reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/S1516-14392009000400002info:eu-repo/semantics/openAccessMartínez-Huitle,Carlos AlbertoCerro-Lopez,MonicaQuiroz,Marco Antonioeng2010-01-19T00:00:00Zoai:scielo:S1516-14392009000400002Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2010-01-19T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false
dc.title.none.fl_str_mv Electrochemical behaviour of dopamine at covalent modified glassy carbon electrode with l-cysteine: preliminary results
title Electrochemical behaviour of dopamine at covalent modified glassy carbon electrode with l-cysteine: preliminary results
spellingShingle Electrochemical behaviour of dopamine at covalent modified glassy carbon electrode with l-cysteine: preliminary results
Martínez-Huitle,Carlos Alberto
dopamine
glassy carbon electrode
cyclic voltammetry
modified electrode
L-Cysteine
title_short Electrochemical behaviour of dopamine at covalent modified glassy carbon electrode with l-cysteine: preliminary results
title_full Electrochemical behaviour of dopamine at covalent modified glassy carbon electrode with l-cysteine: preliminary results
title_fullStr Electrochemical behaviour of dopamine at covalent modified glassy carbon electrode with l-cysteine: preliminary results
title_full_unstemmed Electrochemical behaviour of dopamine at covalent modified glassy carbon electrode with l-cysteine: preliminary results
title_sort Electrochemical behaviour of dopamine at covalent modified glassy carbon electrode with l-cysteine: preliminary results
author Martínez-Huitle,Carlos Alberto
author_facet Martínez-Huitle,Carlos Alberto
Cerro-Lopez,Monica
Quiroz,Marco Antonio
author_role author
author2 Cerro-Lopez,Monica
Quiroz,Marco Antonio
author2_role author
author
dc.contributor.author.fl_str_mv Martínez-Huitle,Carlos Alberto
Cerro-Lopez,Monica
Quiroz,Marco Antonio
dc.subject.por.fl_str_mv dopamine
glassy carbon electrode
cyclic voltammetry
modified electrode
L-Cysteine
topic dopamine
glassy carbon electrode
cyclic voltammetry
modified electrode
L-Cysteine
description The surface of glassy carbon (GC) electrode has been modified by oxidation of L-cysteine. The covalent modified GC electrode with L-Cysteine has been studied, according the supporting electrolyte used. Favourable interactions between the L-cysteine film and DA enhance the current response compared to that at the Nafion GC and bare GC electrodes, achieving better performances than those other electrodes. This behaviour was as result of the adsorption of the cysteine layer film, compact and uniform formation; depending on L-cysteine solution (phosphate buffer or chloridric acid supporting electrolyte) used for modifying GC surface. In cyclic voltammetric measurements, modified electrodes can successfully separate the oxidation/reduction DA peaks in different buffer solutions, but an evident dependence in the response was obtained as function of pH and modified electrode. The modified electrode prepared with L-cysteine/HCl solution was used to obtain the calibration curve and it exhibited a stable and sensitive response to DA. The results are described and discussed in the light of the existing literature.
publishDate 2009
dc.date.none.fl_str_mv 2009-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392009000400002
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392009000400002
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-14392009000400002
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv ABM, ABC, ABPol
publisher.none.fl_str_mv ABM, ABC, ABPol
dc.source.none.fl_str_mv Materials Research v.12 n.4 2009
reponame:Materials research (São Carlos. Online)
instname:Universidade Federal de São Carlos (UFSCAR)
instacron:ABM ABC ABPOL
instname_str Universidade Federal de São Carlos (UFSCAR)
instacron_str ABM ABC ABPOL
institution ABM ABC ABPOL
reponame_str Materials research (São Carlos. Online)
collection Materials research (São Carlos. Online)
repository.name.fl_str_mv Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)
repository.mail.fl_str_mv dedz@power.ufscar.br
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