Voltammetric Behavior of a Modified Electrode With Azide Copper Octa(3-Aminopropyl)Octasilsesquioxane Composite in the Oxidation of Ascorbic Acid

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Data

2011-04-01

Autores

do Carmo, Devaney Ribeiro [UNESP]
Paim, Leonardo Lataro [UNESP]
Silvestrini, Daniela Rodrigues [UNESP]
de Sa, Acelino Cardoso [UNESP]
Bicalho, Urquisa de Oliveira [UNESP]
Stradiotto, Nelson Ramos [UNESP]

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Editor

Electrochemical Science Group

Resumo

A novel nanostructured composite, azide copper octa (3-aminopropyl) octasilsesquioxane (ASCA) 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 ASCA (GPE-ASCA), showed one redox couple with formal potential (E(theta)) = 0.30 V and an irreversible process at 1.1 V (vs Ag/AgCl; NaCl 1.0 mol L(-1); v = 20 mV s(-1)). The redox couple with (E(theta)) = 0.30V presents an electrocatalytic response for determination of ascorbic acid. The modified electrode gives a linear range from 1.0x10(-4) - 1.0x10(-3) mol L(-1) (r = 0.998) for the determination of ascorbic acid with detection limit of 6.9x10(-5) mol L(-1) and standard deviation of 2.3% for n = 3. The amperometric sensitivity was 122.1 mA/mol L(-1) for ascorbic acid. The application this electrode was tested and ascorbic acid in three commercial pharmaceutical product (Cebion, Cewin and Redoxon) have been determined.

Descrição

Palavras-chave

Silsesquioxane, ascorbic acid, graphite paste electrode, voltammetry, modified electrode

Como citar

International Journal of Electrochemical Science. Belgrade: Electrochemical Science Group, v. 6, n. 4, p. 1175-1188, 2011.