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

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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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Electrochemical Science Group


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.



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

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