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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Development and application of an electrochemical sensor modified with multi-walled carbon nanotubes and graphene oxide for the sensitive and selective detection of tetracycline

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Autor(es):
Wong, Ademar [1] ; Scontri, Mateus [1] ; Materon, Elsa Maria [1] ; Lanza, Marcos R. V. [2] ; Sotomayor, Maria D. P. T. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] State Univ Sao Paulo UNESP, Inst Chem, Dept Analyt Chem, BR-14801970 Araraquara, SP - Brazil
[2] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Journal of Electroanalytical Chemistry; v. 757, p. 250-257, NOV 15 2015.
Citações Web of Science: 30
Resumo

In this work, an electrochemical sensor based on a carbon paste electrode modified with a combination of multiwalled carbon nanotubes functionalized with carboxyl groups (MWCNT-COOH), together with graphene oxide (GO), was developed for the sensitive and selective determination of tetracycline. Electrochemical sensors were constructed using carbon paste modified with 2.6% (w/w) of MWCNT-COOH and 3.1% (w/w) of GO. Under the optimal conditions using adsorptive stripping differential pulse voltammetry (AdSDPV), the sensor showed a linear response for tetracycline concentrations between 2.0 x 10(-5) and 3.1 x 10(-4) mol L-1, sensitivity of 1.2 x 10(4) mu A L mol(-1), and a detection limit of 3.6 x 10(-7) mol L-1. The incorporation of GO and MWCNT-COOH in the carbon paste improved the sensitivity, selectivity, and stability of the device. The MWCNT-COOH-GO/CPE sensor was successfully applied for the detection of tetracycline in river water, artificial urine, and pharmaceutical samples, without any need for sample pretreatment. The relative standard deviation (RSD) of the electrochemical measurements was less than 6.0% (n = 3). (C) 2015 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 14/25264-3 - Desenvolvimento e aplicação de novos sensores químicos nanoestruturados baseados em polímeros biomiméticos
Beneficiário:Maria Del Pilar Taboada Sotomayor
Linha de fomento: Auxílio à Pesquisa - Regular