Sol-gel thin-film based mesoporous silica and carbon nanotubes for the determination of dopamine, uric acid and paracetamol in urine

dc.creatorCanevari, TC
dc.creatorRaymundo-Pereira, PA
dc.creatorLanders, R
dc.creatorBenvenutti, EV
dc.creatorMachado, SAS
dc.date2013
dc.date42309
dc.date2014-07-30T18:43:08Z
dc.date2015-11-26T16:47:22Z
dc.date2014-07-30T18:43:08Z
dc.date2015-11-26T16:47:22Z
dc.date.accessioned2018-03-28T23:33:29Z
dc.date.available2018-03-28T23:33:29Z
dc.identifierTalanta. Elsevier Science Bv, v. 116, n. 726, n. 735, 2013.
dc.identifier0039-9140
dc.identifier1873-3573
dc.identifierWOS:000328176000104
dc.identifier10.1016/j.talanta.2013.07.044
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/71781
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/71781
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1274834
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionThis work describes the preparation, characterization and application of a hybrid material composed of disordered mesoporous silica (SiO2) modified with multiwalled carbon nanotubes (MWCNTs), obtained by the sol-gel process using HF as the catalyst. This hybrid material was characterized by N-2 adsorption-desorption isotherms, X-ray powder diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission microscopy (HR-TEM), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). This new hybrid material was used for the construction of a thin film on a glassy carbon electrode. The modified electrode using this material was designated SiO2/MWCNT/GCE. The electrocatalytic properties of the electrode toward dopamine, uric acid and paracetamol oxidation were studied by differential pulse voltammetry. Well-defined and separated oxidation peaks were observed in phosphate buffer solution at pH 7.0, in contrast with the ill-defined peaks observed with unmodified glassy carbon electrodes. The electrode had high sensitivity for the determination of dopamine, uric acid and paracetamol, with the limits of detection obtained using statistical methods, at 0.014, 0.068 and 0.098 mu mol L-1, respectively. The electrode presented some important advantages, including enhanced physical rigidity, surface renewability by polishing and high sensitivity, allowing the simultaneous determination of these three analytes in a human urine sample. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.
dc.description116
dc.description726
dc.description735
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFAPERGS
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFAPESP [2011/23047-7, 2012/17689-9]
dc.languageen
dc.publisherElsevier Science Bv
dc.publisherAmsterdam
dc.publisherHolanda
dc.relationTalanta
dc.relationTalanta
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectCarbon nanotubes
dc.subjectMesoporous silica
dc.subjectElectrochemical sensor
dc.subjectDopamine
dc.subjectUric acid
dc.subjectParacetamol
dc.subjectSimultaneous Electrochemical Determination
dc.subjectPyrolytic-graphite Electrode
dc.subjectAscorbic-acid
dc.subjectSensitive Determination
dc.subjectFunctional-groups
dc.subjectPaste Electrode
dc.subjectModified Gce
dc.subjectSurface
dc.subjectAcetaminophen
dc.subjectBiosensors
dc.titleSol-gel thin-film based mesoporous silica and carbon nanotubes for the determination of dopamine, uric acid and paracetamol in urine
dc.typeArtículos de revistas


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