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Title of Journal: Microchim Acta

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Abbravation: Microchimica Acta

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Springer Vienna

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DOI

10.1007/s11111-014-0208-1

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1436-5073

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The electrocatalytic activity of a supramolecular

Authors: Rita C S Luz Camila M Maroneze Auro A Tanaka Lauro T Kubota Yoshitaka Gushikem Flavio S Damos
Publish Date: 2010/08/01
Volume: 171, Issue: 1-2, Pages: 169-178
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Abstract

The electrocatalytic activity of a supramolecular complex based on cobaltII phthalocyanine tetrasulfonate and ironIII tetraNmethyl4pyridylporphyrin adsorbed on multiwalled carbon nanotubes for the oxidation of Lglutathione GSH was investigated at pH 74 Scanning electron microscopy and energy dispersive Xray spectrometry were used to characterize the morphologies and composition of the materials The modified electrode displayed efficient electrocatalytic activity in terms of oxidation of GSH at an oxidation potential of 0 V versus Ag/AgCl Cyclic voltammetry and amperometry indicated that the oxidation involves 2electrons with a heterogeneous rate constant of 49 × 105 mol−1 L s−1 The response is linear from 2 to 210 μmol  L1 the sensitivity is 1570 μA L mmol−1 the detection limit is 003 μmol L−1 and the relative standard deviation of 110 μmol L−1 GSH was 26 n = 10 The modified electrode was applied to the determination of GSH in erythrocytes and the results were in agreement with those obtained by a method reported in the literature

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