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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.)

Multi-walled carbon nanotubes-cobalt phthalocyanine modified electrode for electroanalytical determination of acetaminophen

Texto completo
Autor(es):
de Holanda, Lucas Freire [1] ; Paulino Ribeiro, Francisco Wirley [2] ; Sousa, Camila Pinheiro [1] ; da Silva Casciano, Paulo Naftali [1] ; de Lima-Neto, Pedro [1] ; Correia, Adriana Nunes [1]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Univ Fed Ceara, Ctr Ciencias, Dept Quim Analit & Fis Quim, Bloco 940, Campus Pici, BR-60440900 Fortaleza, Ceara - Brazil
[2] Univ Fed Sao Carlos, Dept Quim, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: Journal of Electroanalytical Chemistry; v. 772, p. 9-16, JUL 1 2016.
Citações Web of Science: 23
Resumo

Here we described the development of a simple methodology for quantification of acetaminophen (ACOP) using square-wave voltammetry (SWV). A glassy carbon electrode modified with gold nanoparticles, functionalized multi-walled carbon nanotubes and cobalt (II) phthalocyanine was prepared and characterized with cyclic voltammetry, SWV and electrochemical impedance spectroscopy. The optimum experimental conditions, such as pH, buffer and square-wave voltammetric parameters were investigated. From the data analysis of the optimization of experimental conditions, the oxidation of ACOP was characterized as a quasi-reversible and proton-dependent process, where the reaction mechanism presents the participation of equal number of protons and electrons (two protons and two electrons) and k(s) value is equal to 59.0 +/- 25 s(-1). Under the optimized conditions, calibration curves were linear in the concentration range of 1.49 mu mol L-1 to 47.6 mu mol L-1 and 47.6 mu mol L-1 to 107.0 mu mol L-1 with a limit of detection of 0.135 mu mol L-1. Other analytical parameters such as equations of the analytical curves, correlation coefficients, recovery efficiency and relative standard deviation for repeatability and reproducibility experiments were compared to results obtained by the use of UV-Vis spectrophotometry. (C) 2016 Elsevier B.V. All rights, reserved. (AU)

Processo FAPESP: 14/06704-2 - Síntese e caracterização de vanadatos de bismuto para a fotólise da água e degradação de moléculas orgânicas
Beneficiário:Francisco Wirley Paulino Ribeiro
Linha de fomento: Bolsas no Brasil - Pós-Doutorado