Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Voltammetric Determination of Droxidopa in the Presence of Tryptophan Using a Nanostructured Base Electrochemical Sensor

  • Yaghoubian, Halimeh (Department of Chemistry, Bam Branch, Islamic Azad University) ;
  • Jahani, Shohreh (NanoBioElectrochemistry Research Center, Bam University of Medical Sciences) ;
  • Beitollahi, Hadi (Environment Department, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology) ;
  • tajik, Somayeh (NanoBioElectrochemistry Research Center, Bam University of Medical Sciences) ;
  • Hosseinzadeh, Rahman (Department of Organic Chemistry, Faculty of Chemistry, University of Mazandaran) ;
  • Biparva, Pouria (Department of Basic Sciences, Sari Agricultural Sciences and Natural Resources University)
  • Received : 2017.10.01
  • Accepted : 2018.04.09
  • Published : 2018.06.30
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Abstract

A novel carbon paste electrode modified with $Cu-TiO_2$ nanocomposite, 2-(ferrocenylethynyl)fluoren-9-one (2FF) and ionic liquid (IL) (2FF/$Cu-TiO_2$/IL/CPE) was fabricated and employed to study the electrocatalytic oxidation of droxidopa, using cyclic voltammetry (CV), chronoamperometry (CHA) and differential pulse voltammetry (DPV) as diagnostic techniques. It has been found that the oxidation of droxidopa at the surface of modified electrode occurs at a potential of about 295 mV less positive than that of an unmodified CPE. DPV exhibits a linear dynamic range from $5.0{\times}10^{-8}$ to $4.0{\times}10^{-4}M$ and a detection limit of 30.0 nM for droxidopa. Finally this modified electrode was used for simultaneous determination of droxidopa and tryptophan. Also the 2FF/$Cu-TiO_2$/IL/CPE shows excellent ability to determination of droxidopa and tryptophan in real samples.

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References

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