Cathodic Behaviour of Cysteine at a Platinum Electrode

Detalhes bibliográficos
Autor(a) principal: Barroso,M. Fátima
Data de Publicação: 2007
Outros Autores: Santos,Teresa, Sales,M. Goreti F., Delerue-Matos,Cristina, Vaz,M. Carmo V. F.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042007000100010
Resumo: The electroreduction behaviour of cysteine was investigated using cyclic, square wave and differencial pulse voltammetric techniques at a platinum working electrode. The reduction of cysteine occurs at a potential of -0.36 V independent of pH. It is a reversible process, controlled mainly by diffusion and in the mechanism of reduction 1 electron per molecule is involved. Using the voltammetric techniques: Cyclic Voltammetry, Square Wave Voltammetry and Differencial Pulse Voltammetry, different parameters (pH, frequency, step potential, pulse amplitude, scan rate) were optimized in order to develop an electrochemical procedure for determination of cysteine in pharmaceutical products. The repeatability, reproducibility, precision and accuracy of the methods were studied. No electroactive interferences from the excipient were found in the pharmaceutical compounds.
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spelling Cathodic Behaviour of Cysteine at a Platinum Electrodecysteinevoltammetryplatinum electrodepharmaceuticalsreductionThe electroreduction behaviour of cysteine was investigated using cyclic, square wave and differencial pulse voltammetric techniques at a platinum working electrode. The reduction of cysteine occurs at a potential of -0.36 V independent of pH. It is a reversible process, controlled mainly by diffusion and in the mechanism of reduction 1 electron per molecule is involved. Using the voltammetric techniques: Cyclic Voltammetry, Square Wave Voltammetry and Differencial Pulse Voltammetry, different parameters (pH, frequency, step potential, pulse amplitude, scan rate) were optimized in order to develop an electrochemical procedure for determination of cysteine in pharmaceutical products. The repeatability, reproducibility, precision and accuracy of the methods were studied. No electroactive interferences from the excipient were found in the pharmaceutical compounds.Sociedade Portuguesa de Electroquímica2007-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articletext/htmlhttp://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042007000100010Portugaliae Electrochimica Acta v.25 n.1 2007reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAPenghttp://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042007000100010Barroso,M. FátimaSantos,TeresaSales,M. Goreti F.Delerue-Matos,CristinaVaz,M. Carmo V. F.info:eu-repo/semantics/openAccess2023-07-27T12:23:19ZPortal AgregadorONG
dc.title.none.fl_str_mv Cathodic Behaviour of Cysteine at a Platinum Electrode
title Cathodic Behaviour of Cysteine at a Platinum Electrode
spellingShingle Cathodic Behaviour of Cysteine at a Platinum Electrode
Barroso,M. Fátima
cysteine
voltammetry
platinum electrode
pharmaceuticals
reduction
title_short Cathodic Behaviour of Cysteine at a Platinum Electrode
title_full Cathodic Behaviour of Cysteine at a Platinum Electrode
title_fullStr Cathodic Behaviour of Cysteine at a Platinum Electrode
title_full_unstemmed Cathodic Behaviour of Cysteine at a Platinum Electrode
title_sort Cathodic Behaviour of Cysteine at a Platinum Electrode
author Barroso,M. Fátima
author_facet Barroso,M. Fátima
Santos,Teresa
Sales,M. Goreti F.
Delerue-Matos,Cristina
Vaz,M. Carmo V. F.
author_role author
author2 Santos,Teresa
Sales,M. Goreti F.
Delerue-Matos,Cristina
Vaz,M. Carmo V. F.
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Barroso,M. Fátima
Santos,Teresa
Sales,M. Goreti F.
Delerue-Matos,Cristina
Vaz,M. Carmo V. F.
dc.subject.por.fl_str_mv cysteine
voltammetry
platinum electrode
pharmaceuticals
reduction
topic cysteine
voltammetry
platinum electrode
pharmaceuticals
reduction
description The electroreduction behaviour of cysteine was investigated using cyclic, square wave and differencial pulse voltammetric techniques at a platinum working electrode. The reduction of cysteine occurs at a potential of -0.36 V independent of pH. It is a reversible process, controlled mainly by diffusion and in the mechanism of reduction 1 electron per molecule is involved. Using the voltammetric techniques: Cyclic Voltammetry, Square Wave Voltammetry and Differencial Pulse Voltammetry, different parameters (pH, frequency, step potential, pulse amplitude, scan rate) were optimized in order to develop an electrochemical procedure for determination of cysteine in pharmaceutical products. The repeatability, reproducibility, precision and accuracy of the methods were studied. No electroactive interferences from the excipient were found in the pharmaceutical compounds.
publishDate 2007
dc.date.none.fl_str_mv 2007-01-01
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042007000100010
url http://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042007000100010
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv http://scielo.pt/scielo.php?script=sci_arttext&pid=S0872-19042007000100010
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 Sociedade Portuguesa de Electroquímica
publisher.none.fl_str_mv Sociedade Portuguesa de Electroquímica
dc.source.none.fl_str_mv Portugaliae Electrochimica Acta v.25 n.1 2007
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv
repository.mail.fl_str_mv
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