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Electrochemical oxidation and determination of antiretroviral drug nevirapine based on uracil-modified carbon paste electrode

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Abstract

A novel uracil covalently grafted carbon paste electrode (Ura/CPE) based on electro-deposition of uracil on CPE was prepared for the quantitative determination of nevirapine. The records of electrochemical impedance spectroscopy (EIS) and cyclic voltammograms (CV) in K3Fe(CN)6/K4Fe(CN)6 solution illustrated that uracil grafted on CPE efficiently decreased the charge transfer resistance value of electrode and improved the electron transfer kinetic between analyte and electrode. The electrochemical properties of Ura/CPE towards the oxidation of nevirapine were investigated by cyclic voltammetry and differential pulse voltammetry (DPV) in 0.1 M NaOH. The effects of pH and scan rates on the oxidation of nevirapine were studied. The results indicated the participation of the same protons and electrons in the oxidation of nevirapine, and the electrochemical reaction of nevirapine on Ura/CPE is an adsorption-controlled process. Under optimized conditions, the linearity between the oxidation peak current and nevirapine concentration was obtained in the range of 0.1–70.0 μM with detection limit of 0.05 μM and the sensitivity of 2.073 μA mM−1 cm−2 (S/N = 3). The proposed method was also successfully applied to detect the concentration of nevirapine in human serum samples.

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Acknowledgments

This research is supported by the National Natural Science Foundation of China (No. 21271127, 20975066, 41140031, 61171033), the Nano-Foundation of Science and Techniques Commission of Shanghai Municipality (No. 12nm0504200), Leading Academic Discipline Project of Shanghai Municipal Education Commission (J50102).

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Authors and Affiliations

  1. Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, People’s Republic of China

    Li Li, Liqiang Luo, Yaping Ding & Xiao Liu

  2. School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, People’s Republic of China

    Fenfen Zhang & Yaping Ding

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  1. Fenfen Zhang
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  2. Li Li
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  3. Liqiang Luo
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  4. Yaping Ding
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  5. Xiao Liu
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Correspondence to Yaping Ding.

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Zhang, F., Li, L., Luo, L. et al. Electrochemical oxidation and determination of antiretroviral drug nevirapine based on uracil-modified carbon paste electrode. J Appl Electrochem 43, 263–269 (2013). https://doi.org/10.1007/s10800-012-0516-z

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  • DOI: https://doi.org/10.1007/s10800-012-0516-z

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