Determination of ascorbic acid in pharmaceutical preparation and fruit juice using modified carbon paste electrode

Authors

  • Simona Žabčí­ková Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentska 573, 532 10 Pardubice
  • Dai Long Vu Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentska 573, 532 10 Pardubice
  • Libor Červenka Department of Analytical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentska 573, 532 10 Pardubice
  • Vojtěch Tambor Biomedical Research Center, University Hospital Hradec Králové, Sokolská 581, 500 05 Hradec Králové
  • Martina Vašatová Institute of Clinical Biochemistry and Diagnostics, University Hospital Hradec Králové, Sokolská 581, 500 05 Hradec Králové

DOI:

https://doi.org/10.5219/586

Keywords:

ascorbic acid, carbon nanotubes, amperometry, brilliant cresyl blue

Abstract

Acrobic acid is key substance in the human metabolism and the rapid and accurate determination in food is of a great interest. Ascorbic acid is an electroactive compound, however poorly responded on the bare carbon paste electrodes. In this paper, brilliant cresyl blue and multi-walled carbon nanotubes were used for the modification of carbon paste electrode. Brilliant cresyl blue acts as a mediator improving the transition of electrons, whereas multiwalled carbon nanotubes increased the surface of the electrode. Both brilliant cresyl blue and multiwalled carbon nanotubes were added directly to the composite material. The electrochemical behavior of modified electode was determined in electrolyte at various pH, and the effect of the scan rate was also performed. It was shown that the electrochemical process on the surface of the modified carbon paste electrode was diffusion-controlled. The resulted modified carbon paste electrode showed a good electrocatalytic activity towards the oxidation of ascorbic acid at a reduced overpotential of +100 mV descreasing the risk of interferences. A linear response of the ascorbic acid oxidation current measured by the amperometry in the range of 0.1 - 350 µmol.L-1 was obtained applying the sensor for the standard solution. The limit of detection and limit of quantification was found to be 0.05 and 0.15 µmol.L-1, respectively. The novel method was applied for the determination of ascorbic acid in pharmaceutical vitamin preparation and fruit juice, and the results were in good agreement with the standard HPLC method. The presented modification of carbon paste electrode is suitable for the fast, sensitive and very accurate determination of ascorbic acid in fruit juices and pharmaceutical preparation.

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References

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Published

2016-05-14

How to Cite

Žabčí­ková, S. ., Vu, D. L. ., Červenka, L. ., Tambor, V. ., & Vašatová, M. . (2016). Determination of ascorbic acid in pharmaceutical preparation and fruit juice using modified carbon paste electrode. Potravinarstvo Slovak Journal of Food Sciences, 10(1), 255–259. https://doi.org/10.5219/586

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