A Novel Hybrid Composite Formed by Reaction of 4,5-Diphenyl-2-Imidazolethiol with Hexacyanoferrate (III) and Subsequent Reaction with Copper (II): Preparation, Characterization and a Voltammetric Application for Determination of L-Glutatione

Autor(es)

Silvestrini, Daniela Rodrigues ^[1] ; Bicalho, Urquisa de Oliveira ^[1] ; do Carmo, Devaney Ribeiro ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Fac Engn Ilha Solteira, Dept Quim Fis, BR-15385000 Ilha Solteira, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: International Journal of Electrochemical Science; v. 9, n. 8, p. 4114-4128, AUG 2014.
• Citações Web of Science: 1

Resumo

A novel Hybrid composite formed by interaction of 4,5-Diphenyl-2-Imidazolethiol and copper hexacyanoferrate (III) (CuHDIT) was characterized by Fourier transform infrared spectra (FTIR), x-ray diffraction (XRD), scanning electron and energy dispersive (SEM). CuHDIT was incorporated into a graphite paste electrode and the electrochemical studies were conducted with cyclic voltammetry. The cyclic voltammogram of the modified graphite paste electrode with CuHDIT, showed two redox couple with formal potential E-theta'=0.24 and 0.74 V (vs Ag/AgCl(sat.), KCl, 1.0 mol L-1; v = 20 mV s(-1)), attributed to the Cu+/Cu2+ and Fe2+(CN) 6/Fe3+(CN)(6) redox processes respectively. The redox second redox couple (0.74V) presents an electrocatalytic response for determination of L-Glutatione. The modified electrode showed a linear response from 5.0x10(-5) to 9.0x10(-4) mol L-1. The method showed a detection limit of 5.33x10(-5) mol L-1 with a relative standard deviation of +/- 2% (n = 3) and amperometric sensitivity of 12.52 mA mol L-1. (AU)

• Processo FAPESP: 12/05438-1 - Desenvolvimento de novos silsesquioxanos nanoestruturados híbridos organofuncionalizados: preparação, caracterização e suas aplicações como sensores de compostos e íons de interesse ambiental e biológico
• Beneficiário: Devaney Ribeiro Do Carmo
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/11306-0 - Quantificação eletroquímica de analitos de interesse ambiental e biológico, empregando novos materiais preparados a partir de silsesquioxanos funcionalizados.
• Beneficiário: Daniela Silvestrini Fernandes
• Modalidade de apoio: Bolsas no Brasil - Doutorado