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Simultaneous determination of levodopa and carbidopa by a novel nanostructure modified carbon paste electrode

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Abstract

The electrochemical behavior of levodopa (LD) was investigated on the surface of a carbon paste electrode modified with TiO2 nanoparticles and 2,2′-(1,2 butanediylbis(nitriloethylidyne))-bis-hydroquinone (BNH). The prepared modified electrode showed an efficient catalytic role in the electrochemical oxidation of LD, leading to a remarkable decrease in oxidation overpotential and enhancement of the kinetics of the electrode reaction. The mechanism of the electrocatalytic process on the surface of the modified electrode was analyzed by obtaining the cyclic voltammograms in various potential sweep rates. This modified electrode exhibited well-separated oxidation peaks for LD and carbidopa (CD). The differential pulse voltammetry was applied as a very sensitive analytical method for the determination of LD and CD. A linear dynamic range of 2.0–600.0 and 20.0–400.0 μM with a detection limit of 0.2 μM (with sensitivity of 0.199 μA μM−1) and 10 μM (with sensitivity of 0.024 μA μM−1) was obtained for LD and CD, respectively. The modified electrode was prepared quite easily and renewed on the surface by simple polishing.

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Acknowledgments

The authors wish to thank Yazd University Research Council, IUT Research Council and Excellence in Sensors for financial support of this research. We also gratefully acknowledge the help we received from Dr N. Taghavinia of Sharif University of Technology for the synthesis of the nanoparticles.

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Authors and Affiliations

  1. Faculty of Science, Department of Chemistry, Yazd University, Yazd, 89195-741, Iran

    Mohammad Mazloum-Ardakani, Hadi Beitollahi & Mohammad Ali Sheikh-Mohseni

  2. Faculty of Chemistry, Department of Organic Chemistry, University of Kashan, Kashan, Iran

    Hossein Naeimi

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  1. Mohammad Mazloum-Ardakani
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  2. Hadi Beitollahi
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  3. Mohammad Ali Sheikh-Mohseni
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  4. Hossein Naeimi
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Correspondence to Mohammad Mazloum-Ardakani.

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Mazloum-Ardakani, M., Beitollahi, H., Sheikh-Mohseni, M.A. et al. Simultaneous determination of levodopa and carbidopa by a novel nanostructure modified carbon paste electrode. J IRAN CHEM SOC 9, 27–34 (2012). https://doi.org/10.1007/s13738-011-0002-2

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  • DOI: https://doi.org/10.1007/s13738-011-0002-2

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