Electrochemical Properties of the Oxo-Manganese-Phenanthroline Complex Immobilized on Ion-Exchange Polymeric Film and Its Application as Biomimetic Sensor for Sulfite 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, Dept Phys Chem & Biol, Presidente Prudente, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Electroanalysis; v. 26, n. 10, p. 2182-2190, OCT 2014.
• Citações Web of Science: 11

Resumo

A biomimetic sensor containing the oxo-bridged dinuclear manganese-phenanthroline complex incorporated into a cation-exchange polymeric film deposited onto glassy carbon electrode for detection of sulfite was studied. Cyclic voltammetry at the modified electrode in universal buffer showed a two electron oxidation/reduction of the couple Mn-IV(mu-O)(2)Mn-IV/Mn-III(mu-O)(2)Mn-III. The sensor exhibited electrocatalytic property toward sulfite oxidation with a decrease of the overpotential of 450 mV compared with the glassy carbon electrode. A plot of the anodic current versus the sulfite concentration for potential fixed (+0.15 V vs. SCE) at the sensor was linear in the 4.99 x 10(-7) to 2.49 x 10(-6) mol L-1 concentration range and the concentration limit was 1.33 x 10(-7) mol L-1. The mediated mechanism was derived by Michaelis-Menten kinetics. The calculated kinetics values were Michaelis-Menten rate constant=K-M(app)=1.33 mu mol L-1, catalytic rate constant=6.06 x 10(-3) s(-1) and heterogeneous electro-chemical rate constant=3.61 x 10(-5) cm s(-1). (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