Desenvolvimento e aplicação de eletrodos à base de nanotubos de carbono
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/6115 |
Resumo: | The electrodes based on carbon nanotubes (CNTs) were prepared in the form of paste of CNTs/Graphite and film on glassy carbon electrode. These electrodes were electrochemically characterized by their response in potassium ferricyanide and hydroquinone. Considering the obtained results, the electrode in the form of paste was selected for analytical applications. In this work, the paste electrode was also prepared of pure CNTs, ie, without addicting of graphite. For the evaluation of analytical capabilities of the CNTs paste electrode, studies were performed about quantification of paraquat, rutin and quercetin, using differential pulse voltammetry. Regarding the quantification of paraquat, an analytical curve was obtained, with a detection limit of 2.8 x10-6mol L-1. The performance of the carbon nanotubes paste electrode in the determination of rutin, an analytical curve was obtained, with a detection limit of 3.39 x10-8 mol L-1. The content of rutin was determined in pharmaceutical formulations with relative error lower to 5%. For the quantification of quercetin, an analytical curve was obtained with a detection limit of 5.43 x10-7 mol L-1. Chemical modifiers, such as copper microparticles and acetylcholinesterase enzyme, were incorpored in the CNTs paste electrode. The CNTs paste electrode odified with copper microparticles (Cu-CNTs) was used for quercetin determination and the results indicated the formation of quercetin-Cu (II) complex on the electrode surface. The analytical curve obtained for this system presented a detection limit of 2.36 x10-7 mol L-1. The determination of quercetin in a sample of industrialized apple juice was carried out observing the recovery between 98.8 and 102.9%. The biosensor CNTs-AchE was optimized with respect to the work potential, concentration of acetylthiocoline iodide substrate and the incubation time and analytical curve was obtained for chlorfenvinphos with a detection limit of 1.15 x10-7 mol L-1. Even with respect to chlorfenvinphos, its determination was possible in samples containing the pesticide, with relative error lower to 2.5%. |
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Oliveira, Aline Carlos deMascaro, Lucia Helenahttp://lattes.cnpq.br/9130022476352844http://lattes.cnpq.br/05998136680919570d8079a3-cb54-49f6-bb49-f80669a5ac102016-06-02T20:34:11Z2009-09-142016-06-02T20:34:11Z2008-12-11OLIVEIRA, Aline Carlos de. DEVELOPMENT AND APPLICATION OF ELECTRODE BASE ON CARBON NANOTUBES. 2008. 146 f. Tese (Doutorado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2008.https://repositorio.ufscar.br/handle/ufscar/6115The electrodes based on carbon nanotubes (CNTs) were prepared in the form of paste of CNTs/Graphite and film on glassy carbon electrode. These electrodes were electrochemically characterized by their response in potassium ferricyanide and hydroquinone. Considering the obtained results, the electrode in the form of paste was selected for analytical applications. In this work, the paste electrode was also prepared of pure CNTs, ie, without addicting of graphite. For the evaluation of analytical capabilities of the CNTs paste electrode, studies were performed about quantification of paraquat, rutin and quercetin, using differential pulse voltammetry. Regarding the quantification of paraquat, an analytical curve was obtained, with a detection limit of 2.8 x10-6mol L-1. The performance of the carbon nanotubes paste electrode in the determination of rutin, an analytical curve was obtained, with a detection limit of 3.39 x10-8 mol L-1. The content of rutin was determined in pharmaceutical formulations with relative error lower to 5%. For the quantification of quercetin, an analytical curve was obtained with a detection limit of 5.43 x10-7 mol L-1. Chemical modifiers, such as copper microparticles and acetylcholinesterase enzyme, were incorpored in the CNTs paste electrode. The CNTs paste electrode odified with copper microparticles (Cu-CNTs) was used for quercetin determination and the results indicated the formation of quercetin-Cu (II) complex on the electrode surface. The analytical curve obtained for this system presented a detection limit of 2.36 x10-7 mol L-1. The determination of quercetin in a sample of industrialized apple juice was carried out observing the recovery between 98.8 and 102.9%. The biosensor CNTs-AchE was optimized with respect to the work potential, concentration of acetylthiocoline iodide substrate and the incubation time and analytical curve was obtained for chlorfenvinphos with a detection limit of 1.15 x10-7 mol L-1. Even with respect to chlorfenvinphos, its determination was possible in samples containing the pesticide, with relative error lower to 2.5%.Os eletrodos de CNTs foram preparados na forma de pasta de CNTs/Grafite e filme sobre eletrodo de carbono vítreo. Estes eletrodos foram caracterizados eletroquimicamente por meio de sua resposta em ferricianeto de potássio e hidroquinona. Considerando os resultados obtidos, o eletrodo na forma de pasta foi selecionado para aplicações analíticas. Neste trabalho também foi confeccionado eletrodo de pasta de CNTs puro, ou seja, sem a adição de grafite. Para a avaliação das potencialidades analíticas do eletrodo de pasta de CNTs, foram realizados estudos de quantificação de paraquat, rutina e quercetina, utilizando-se voltametria de pulso diferencial. Em relação à quantificação de paraquat foi obtida uma curva analítica, com limite de detecção de 2,8x10-6mol L-1. Avaliando-se o desempenho do eletrodo quanto à quantificação de rutina foi obtida uma curva analítica com limite de detecção de 3,39x10-8mol L-1. O teor de rutina foi determinado em formulações farmacêuticas com variação inferior a 5%. Para a quantificação de quercetina foi obtida uma curva analítica com limite de detecção de 5,43x10-7 mol L-1. Modificadores químicos, como micropartículas de cobre e a enzima acetilcolinesterase, foram imobilizados na matriz do eletrodo de pasta de CNTs. O eletrodo de pasta de CNTs modificado com micropartículas de cobre (CNTs-Cu) foi utilizado para a determinação de quercetina e os resultados indicaram a formação de complexo quercetina-Cu (II) sobre a superfície do eletrodo. Nesse caso a curva analítica para o sistema apresentou um limite de detecção de 2,36x10-7 mol L-1. A determinação de quercetina em amostra de suco de maçã industrializado foi efetuada observando-se recuperação entre 98,8 e 102,9%. O biossensor CNTs-AchE foi otimizado em relação ao potencial de trabalho, concentração de substrato iodeto de acetiltiocoilna e tempo de incubação e foi obtida uma curva analítica para o carrapaticida clorfenvinfos com limite de detecção de 1,15x10-7 mol L-1. Ainda com relação ao clorfenvinfos, foi possível a sua determinação em amostra de carrapaticida, com variação inferior a 2,5%.Financiadora de Estudos e Projetosapplication/pdfporUniversidade Federal de São CarlosPrograma de Pós-Graduação em Química - PPGQUFSCarBRMétodos elétricosEletrodosNanotubos de carbonoCIENCIAS EXATAS E DA TERRA::QUIMICADesenvolvimento e aplicação de eletrodos à base de nanotubos de carbonoDEVELOPMENT AND APPLICATION OF ELECTRODE BASE ON CARBON NANOTUBESinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesis-1-148af9879-81a8-4651-b821-5243ab976eb2info:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINAL2401.pdfapplication/pdf2203723https://repositorio.ufscar.br/bitstream/ufscar/6115/1/2401.pdf42910fbb271c3ce58fb1a8b8b4571d88MD51THUMBNAIL2401.pdf.jpg2401.pdf.jpgIM Thumbnailimage/jpeg8169https://repositorio.ufscar.br/bitstream/ufscar/6115/2/2401.pdf.jpga533adefa6f80a89e847106b2f0a73ceMD52ufscar/61152023-09-18 18:31:10.927oai:repositorio.ufscar.br:ufscar/6115Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:31:10Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Desenvolvimento e aplicação de eletrodos à base de nanotubos de carbono |
dc.title.alternative.eng.fl_str_mv |
DEVELOPMENT AND APPLICATION OF ELECTRODE BASE ON CARBON NANOTUBES |
title |
Desenvolvimento e aplicação de eletrodos à base de nanotubos de carbono |
spellingShingle |
Desenvolvimento e aplicação de eletrodos à base de nanotubos de carbono Oliveira, Aline Carlos de Métodos elétricos Eletrodos Nanotubos de carbono CIENCIAS EXATAS E DA TERRA::QUIMICA |
title_short |
Desenvolvimento e aplicação de eletrodos à base de nanotubos de carbono |
title_full |
Desenvolvimento e aplicação de eletrodos à base de nanotubos de carbono |
title_fullStr |
Desenvolvimento e aplicação de eletrodos à base de nanotubos de carbono |
title_full_unstemmed |
Desenvolvimento e aplicação de eletrodos à base de nanotubos de carbono |
title_sort |
Desenvolvimento e aplicação de eletrodos à base de nanotubos de carbono |
author |
Oliveira, Aline Carlos de |
author_facet |
Oliveira, Aline Carlos de |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/0599813668091957 |
dc.contributor.author.fl_str_mv |
Oliveira, Aline Carlos de |
dc.contributor.advisor1.fl_str_mv |
Mascaro, Lucia Helena |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/9130022476352844 |
dc.contributor.authorID.fl_str_mv |
0d8079a3-cb54-49f6-bb49-f80669a5ac10 |
contributor_str_mv |
Mascaro, Lucia Helena |
dc.subject.por.fl_str_mv |
Métodos elétricos Eletrodos Nanotubos de carbono |
topic |
Métodos elétricos Eletrodos Nanotubos de carbono CIENCIAS EXATAS E DA TERRA::QUIMICA |
dc.subject.cnpq.fl_str_mv |
CIENCIAS EXATAS E DA TERRA::QUIMICA |
description |
The electrodes based on carbon nanotubes (CNTs) were prepared in the form of paste of CNTs/Graphite and film on glassy carbon electrode. These electrodes were electrochemically characterized by their response in potassium ferricyanide and hydroquinone. Considering the obtained results, the electrode in the form of paste was selected for analytical applications. In this work, the paste electrode was also prepared of pure CNTs, ie, without addicting of graphite. For the evaluation of analytical capabilities of the CNTs paste electrode, studies were performed about quantification of paraquat, rutin and quercetin, using differential pulse voltammetry. Regarding the quantification of paraquat, an analytical curve was obtained, with a detection limit of 2.8 x10-6mol L-1. The performance of the carbon nanotubes paste electrode in the determination of rutin, an analytical curve was obtained, with a detection limit of 3.39 x10-8 mol L-1. The content of rutin was determined in pharmaceutical formulations with relative error lower to 5%. For the quantification of quercetin, an analytical curve was obtained with a detection limit of 5.43 x10-7 mol L-1. Chemical modifiers, such as copper microparticles and acetylcholinesterase enzyme, were incorpored in the CNTs paste electrode. The CNTs paste electrode odified with copper microparticles (Cu-CNTs) was used for quercetin determination and the results indicated the formation of quercetin-Cu (II) complex on the electrode surface. The analytical curve obtained for this system presented a detection limit of 2.36 x10-7 mol L-1. The determination of quercetin in a sample of industrialized apple juice was carried out observing the recovery between 98.8 and 102.9%. The biosensor CNTs-AchE was optimized with respect to the work potential, concentration of acetylthiocoline iodide substrate and the incubation time and analytical curve was obtained for chlorfenvinphos with a detection limit of 1.15 x10-7 mol L-1. Even with respect to chlorfenvinphos, its determination was possible in samples containing the pesticide, with relative error lower to 2.5%. |
publishDate |
2008 |
dc.date.issued.fl_str_mv |
2008-12-11 |
dc.date.available.fl_str_mv |
2009-09-14 2016-06-02T20:34:11Z |
dc.date.accessioned.fl_str_mv |
2016-06-02T20:34:11Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
OLIVEIRA, Aline Carlos de. DEVELOPMENT AND APPLICATION OF ELECTRODE BASE ON CARBON NANOTUBES. 2008. 146 f. Tese (Doutorado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2008. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/6115 |
identifier_str_mv |
OLIVEIRA, Aline Carlos de. DEVELOPMENT AND APPLICATION OF ELECTRODE BASE ON CARBON NANOTUBES. 2008. 146 f. Tese (Doutorado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2008. |
url |
https://repositorio.ufscar.br/handle/ufscar/6115 |
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por |
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por |
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-1 -1 |
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48af9879-81a8-4651-b821-5243ab976eb2 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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Universidade Federal de São Carlos |
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Programa de Pós-Graduação em Química - PPGQ |
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UFSCar |
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BR |
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Universidade Federal de São Carlos |
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