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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
do Carmo, Devaney Ribeiro [1] ; Paim, Leonardo Lataro [2] ; Silvestrini, Daniela Rodrigues [1] ; de Sa, Acelino Cardoso [1] ; Bicalho, Urquisa de Oliveira [1] ; Stradiotto, Nelson Ramos [2]
Total Authors: 6
Affiliation:
[1] UNESP Univ Estadual Paulista, Dept Quim & Fis, Fac Engn Ilha Solteira, BR-15385000 Ilha Solteira, SP - Brazil
[2] UNESP Univ Estadual Paulista, Inst Quim Araraquara, BR-14801970 Araraquara, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: International Journal of Electrochemical Science; v. 6, n. 4, p. 1175-1188, APR 2011.
Web of Science Citations: 12
Abstract

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. (AU)