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Electrochemical Preanodization of Glassy Carbon Electrode and Application to Determine Chloramphenicol

Nguyen, Minh Truc, and Mortensen, John, and Nguyen, Ba Hoai Anh, (2008) Electrochemical Preanodization of Glassy Carbon Electrode and Application to Determine Chloramphenicol. Malaysian Journal of Analytical Sciences, 12 (3). pp. 586-592. ISSN 13942506

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Official URL: http://pkukmweb.ukm.my/~mjas/v12_n3/Nguyen%20Minh%20Truc.pdf

Affiliations

Ho Chi Minh University of Natural Sciences, Vietnam. Faculty of Chemistry, Dept. of Analytical Chemistry
o Chi Minh University of Natural Sciences, Vietnam. Faculty of Chemistry, Dept. of Analytical Chemistry
o Chi Minh University of Natural Sciences, Vietnam. Faculty of Chemistry, Dept. of Analytical Chemistry

Abstract

This paper suggested a method to enhance the performance of carbon electrodes for the determination of chloramphenicol (CAP). The sensitivity and the reproducibility of the carbon electrodes could be enhanced easily by electrochemical pretreatment. Some kinds of carbon material were studied including glassy carbon, graphite carbon and pyrolytic carbon. Numerous kinds of supporting electrolyte have been tried. For glassy carbon electrode, the acidic solution, H2SO4 5mM, resulted in best performance at pretreated voltage of +2.1V (vs. Ag/AgCl) in duration of 250 second. However, for graphite and pyrolytic carbon electrodes, the phosphate buffer solution pH 6.0 gave the best performance at +1.7V (vs. Ag/AgCl) in duration of 20 seconds. The detection limit could be at very low concentration of CAP: 0.8ng/ml for glassy carbon electrode, 3.5ng/ml for graphite carbon electrode. The method was successful applied to aqua-agriculture water sample and milk sample with simple extraction as well as direct ointment sample analysis.

Item Type:Journal
Keywords:Chloramphenicol, electrochemical pretreatment, voltammetry, glassy carbon electrode
Subjects:Q Science, Computer Science
ID Code:5171

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