Simultaneous voltammetric determination of uric acid and ascorbic acid using carbon paste/cobalt Schiff base composite electrode

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• 作者：Mandana Amiri (12) mandanaamiri@yahoo.com
  Abolfazl Bezaatpour (2)
  Zohreh Pakdel (1)
  Khadijeh Nekoueian (1)
• 关键词：Uric acid – Ascorbic acid – Carbon paste electrode – Schiff base complex – Voltammetric determination
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2012
• 出版时间：June 2012
• 年：2012
• 卷：16
• 期：6
• 页码：2187-2195
• 全文大小：1.3 MB
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• 作者单位：1. Department of Chemistry, Payame Noor University (PNU), Ardabil, Iran2. Department of Chemistry, University of Mohaghegh Ardabili, Ardabil, Iran
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Analytical Chemistry
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  Condensed Matter
  Electronic and Computer Engineering
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1433-0768

文摘

Differential pulse and cyclic voltammetry were applied for the oxidation of mixture of uric acid and ascorbic acid at the surface of carbon paste/cobalt Schiff base composite electrode. The electrooxidation of these compounds at bare electrode is sluggish, and there is no suitable peak separation between them. However, using cobalt methyl salophen as modifier, two well-defined anodic waves with a considerable enhancement in the peak current and a remarkable peak potential separation near 315 mV are obtained. It can improve the kinetics of electron transfer for both compounds remarkably. All these improvements are created because of the electrocatalytic property of cobalt Schiff base complex. The effect of some parameters such as pH and scan rates were studied. All the anodic peak currents for the oxidation of ascorbic acid and uric acid shifted toward more negative potential with an increase in pH, revealing that protons have taken part in their electrode reaction processes. The best peak separation with appropriate current was obtained for pH 4.0. A linear range of 5.0?×?10?4 to 1.0?×?10?8 and 1.0?×?10?3 to 1.0?×?10?8 M with detection limit of 8.0?×?10?9 and 8.0?×?10?9 M was obtained for ascorbic acid and uric acid using differential pulse voltammetry at the surface of modified electrode, respectively. Analytical utility of the modified electrode has been examined successfully using human urine samples and vitamin C commercial tablets.