Application of oxo-manganese complex immobilized on ion-exchange polymeric film as biomimetic sensor for nitrite ions

Autor(es)

Machini, Wesley B. S. ^[1] ; Teixeira, Marcos F. S. ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Fac Sci & Technol, BR-19060900 Presidente Prudente, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SENSORS AND ACTUATORS B-CHEMICAL; v. 217, p. 58-64, OCT 1 2015.
• Citações Web of Science: 8

Resumo

A biomimetic sensor based on oxo-bridged dinuclear manganese-phenanthroline complex immobilized into an ion-exchange polymeric film deposited on glassy carbon electrode was applied to detection of nitrite ions and studied according to their kinetics parameters. The cyclic voltammetry at the modified electrode in universal buffer showed a two electron oxidation/reduction of the couple Mn-IV(mu-0)(2) Mn-IV/Mn-III(mu-0)(2) Mn-III and electrocatalytic property toward nitrite oxidation with a decrease of the overpotential of 320 mV compared with the bare glassy carbon electrode. A plot of the anodic current vs. the nitrite ions concentration for potential fixed (+0.480) at the biomimetic sensor was linear in the 2.49 x 10(-6) to 9.90 x 10(-6) mol L-1 concentration range with a detection limit of 6.50 x 10(-6) mol L-1. The kinetic mechanism was derived by Michaelis-Menten, then, kinetics parameters were calculated through four methods: Lineweaver-Burke, Eadie-Hofstee, Hanes-Woolf and Nonlinear curve fitting. The best results were Michaelis-Menten rate constant = 3.42 mu mol L-1, catalytic rate constant = 0.0114 s(-1), catalytic efficiency = 3.3 x 10(3) (mol L)(-1) s(-1) and heterogeneous electrochemical rate constant = 1.15 x 10(-5) cm s(-1). (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 05/01296-4 - Desenvolvimento de metodologia analítica empregando eletrodos modificados com oxo complexos polinucleares de rutênio encapsulado em zeolita
• Beneficiário: Marcos Fernando de Souza Teixeira
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 13/10469-6 - Aplicação eletroanalítica de complexo biomimetizador de manganês(IV) contendo ligante 2,3,5,6-tetraquis(2-piridil)pirazina
• Beneficiário: Wesley Bruno da Silva Machini
• Modalidade de apoio: Bolsas no Brasil - Mestrado