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Determina??o simult?nea de ?cido ?rico e epinefrina empregando um sensor ? base de nanotubos de carbono e bis-tetracianoquinodimetaneto de tris- fenantrolina de cobre (ii) / Development and application of a voltammetric sensor for simultaneous analysis of Uric Acid and Epinephrine in the presence of Ascorbic Acid employing a glassy carbon electrode modified with (tris(1,10-phenantroline)copper(II) bis(tetracyanoquinodimethanide)) functionalized multi-wall carbon nanotubes

?rea de concentra??o: Qu?mica Anal?tica / Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-19T12:10:06Z
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license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-19T12:20:25Z (GMT) No. of bitstreams: 2
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Previous issue date: 2013 / Item withdrawn by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-19T13:55:12Z
Item was in collections:
PPGQ - Mestrado em Qu?mica (Disserta??es) (ID: 150)
PPGQ - Mestrado em Qu?mica (Disserta??es) (ID: 150)
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license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Item reinstated by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2014-12-19T13:55:58Z
Item was in collections:
PPGQ - Mestrado em Qu?mica (Disserta??es) (ID: 150)
PPGQ - Mestrado em Qu?mica (Disserta??es) (ID: 150)
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license_rdf: 23898 bytes, checksum: e363e809996cf46ada20da1accfcd9c7 (MD5) / Funda??o de Amparo ? Pesquisa do estado de Minas Gerais (FAPEMIG) / No presente trabalho foi constru?do um sensor sens?vel e seletivo para determina??o de ?cido ?rico e epinefrina por voltametria de pulso diferencial a partir da modifica??o da superf?cie de um eletrodo de carbono v?treo com nanotubos de carbono de paredes m?ltiplas funcionalizados com Cu(phen)3(TCNQ)2 (bis(tetracianoquinodimetaneto) de tris(fenantrolina) de cobre (II)). O comp?sito foi caracterizado por Microscopia Eletr?nica de Varredura, Espectroscopia de Imped?ncia Eletroqu?mica e Espectroscopia de Infravermelho com Transformada de Fourrier. Os coeficientes de transfer?ncia de carga an?dico e cat?dico e a constante de velocidade de transfer?ncia eletr?nica foram determinados para a rea??o eletroqu?mica envolvendo os nanotubos funcionalizados, os valores encontrados foram 0,58, 0,41 e 2,9 s-1, respectivamente. O n?mero de el?trons e a constante heterog?nea de transfer?ncia eletr?nica envolvidos na rea??o de oxida??o do ?cido ?rico e epinefrina foram calculados obtendo os valores de 2 el?trons, 2,6.104 para 0,1 mmolL-1 e 1,2.104 mol-1s-1L para 0,5 mmolL-1 de ?cido ?rico e de 2 el?trons, 3,5.105 para 0,1 mmolL-1 e 1,1.104 mol-1s-1L para 0,5 mmolL-1 de EP. Um intervalo de resposta linear de 20 a 440 ?molL-1, com sensibilidade de 0,024 ALmol-1, limite de quantifica??o de 23,23 ?molL-1 e limite de detec??o de 7 ?molL-1 para a EP e intervalo de resposta linear de 10 a 420 ?molL-1, com sensibilidade de 0,079 ALmol-1, limite de quantifica??o de 7,09 ?molL-1 e limite de detec??o de 2,13 ?molL-1 para a AU foram obtidos para o sensor em condi??es otimizadas. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Qu?mica, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2013. / ABSTRACT
A sensitive and selective sensor for determination of uric acid and epinephrine in the presence of ascorbic acid by differential pulse voltammetry using a glassy carbon electrode modified with Cu(phen)3(TCNQ)2 (tris(1,10-phenantroline)copper(II) bis(tetracyanoquinodimethanide)) functionalized multi-wall carbon nanotubes was developed in this work. The composite was characterized by Scanning Electron Microscopy, Electrochemical Impedance Spectroscopy and Fourier Transform Infrared Spectroscopy. The anodic and cathodic transfer coefficients and the standard rate transfer constant for electrochemical reaction of functionalized nanotubes were determined; the found values were 0,58, 0,41 and 2,9 s-1, respectively. The number of electrons and the heterogeneous rate constant involved in the oxidation reaction of uric acid and epinephrine was calculated, the values obtained were 2 electrons, 2.6 x 104 for 0.1 mmolL-1 and 1.2 x 104 mol-1s-1L for 0.5 mmolL-1 of uric acid and 2 electrons, 3.5x105 for 0,1 mmolL-1 and 1.1x104 mol-1s-1L for 0.5 mmolL-1 of epinephrine. A linear response range from 20 up to 440 ?molL-1, with a sensitivity of 0.024 A.L.mol-1, quantification and detection limits of 23.23 and 7 ?molL-1 for epinephrine and linear response range from 10 up to 420 ?molL-1, with a sensitivity of 0.079 A.L.mol-1, quantification and detection limits of 7.09 and 2.13 ?mol/L for uric acid were obtained for this sensor in optimized conditions.

Identiferoai:union.ndltd.org:IBICT/oai:acervo.ufvjm.edu.br/jspui:1/294
Date16 August 2013
CreatorsPimentel, Dilton Martins
ContributorsRichster, Eduardo Martins, Damos, Fl?vio Santos, Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM), Luz, Rita de C?ssia Silva
PublisherUFVJM
Source SetsIBICT Brazilian ETDs
LanguagePortuguese
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis
Sourcereponame:Repositório Institucional da UFVJM, instname:Universidade Federal dos Vales do Jequitinhonha e Mucuri, instacron:UFVJM
RightsA concess?o da licen?a deste item refere-se ao ? termo de autoriza??o impresso assinado pelo autor, assim como na licen?a Creative Commons, com as seguintes condi??es: Na qualidade de titular dos direitos de autor da publica??o, autorizo a Universidade Federal dos Vales do Jequitinhonha e Mucuri e o IBICT a disponibilizar por meio de seus reposit?rios, sem ressarcimento dos direitos autorais, de acordo com a Lei n? 9610/98, o texto integral da obra disponibilizada, conforme permiss?es assinaladas, para fins de leitura, impress?o e/ou download, a t?tulo de divulga??o da produ??o cient?fica brasileira, e preserva??o, a partir desta data., info:eu-repo/semantics/openAccess

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