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|標題:||Amperometric determination of ascorbic acid at a ferricyanide-doped Tosflex-modified electrode||作者:||Zen, J.M.
|關鍵字:||tosflex;Fe(CN)(6)(3-/4-);ascorbic acid;mediated oxidation;glassy-carbon electrode;ferrocyanide;oxidation;films;poly(4-vinylpyridine);electrocatalysis;binding||Project:||Electrochemistry Communications||期刊/報告no：:||Electrochemistry Communications, Volume 2, Issue 11, Page(s) 782-785.||摘要:||
Tosflex, a perfluoro-anionic exchange membrane, is not studied as much as Nafion for electroanalytical applications. In this study, electrocatalytic oxidation of ascorbic acid (AA) was demonstrated using a ferricyanide-doped Tosflex-modified electrode in pH 5 phosphate buffer solution. The modified electrode showed good stability over the studied pn range of 3-12. The electrocatalytic oxidation of AA on the modified electrode follows the surface-saturation kinetics in terms of Michaelis-Menten (MM) mechanism. The analytical estimations were performed amperometrically under hydrodynamic conditions at an applied potential of 300 mV versus Ag/AgCl. A linear response was observed in the range of 0-50 muM with a regression coefficient of 0.998. (C) 2000 Published by Elsevier Science S.A.
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