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

Cobalt oxide/tetraruthenated cobalt-porphyrin composite for hydrogen peroxide amperometric sensors

Texto completo
Autor(es):
Quintino‚ M.S.M. ; Winnischofer‚ H. ; Araki‚ K. ; Toma‚ H.E. ; Angnes‚ L.
Número total de Autores: 5
Tipo de documento: Artigo Científico
Fonte: ANALYST; v. 130, n. 2, p. 221-226, 2005.
Resumo

A new composite material constituted by mu-{5,10,15,20- tetra(4-pyridyl) porphyrinato cobalt(III)}tetrakis-{ chloro-bis-(2,2'-bipyridine) ruthenium(II)} complex ( or CoTRP) and cobalt oxide, exhibiting high stability and sensitivity for the quantification of hydrogen peroxide, was obtained by the electrochemical polymerization of the tetraruthenated cobalt porphyrin in alkaline medium. The optimized experimental conditions for the preparation of the modified glassy carbon electrodes and for analysis of H2O2 were carefully determined. Fast sequential analysis ( 120 determinations h(-1)) in a wide linear dynamic range ( 5.0 x 10(-7) mol L-1 to 2.0 x 10(-3) mol L-1), with high sensitivity and low detection limit (2.0 x 10(-7) mol L-1), was achieved by using these electrodes and the batch injection analysis (BIA) technique. Such characteristics allied to a good stability were explored for the specific determination of hydrogen peroxide in six commercial cosmetics and pharmaceutical product samples, giving results in excellent agreement with those obtained by the spectrophotometric method. (AU)

Processo FAPESP: 00/06560-8 - Desenvolvimento da química e dispositivos metal-orgânicos supramoleculares
Beneficiário:Henrique Eisi Toma
Modalidade de apoio: Auxílio à Pesquisa - Temático
Processo FAPESP: 03/07225-6 - Desenvolvimento de eletrodos modificados por metaloporfirinas visando aplicações analíticas
Beneficiário:Maria Do Socorro Maia Quintino
Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado