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Microchimica Acta

, Volume 173, Issue 1–2, pp 241–247 | Cite as

Electrochemistry and voltammetric determination of L-tryptophan and L-tyrosine using a glassy carbon electrode modified with a Nafion/TiO2-graphene composite film

  • Yang FanEmail author
  • Jin-Hang Liu
  • Hai-Ting Lu
  • Qin Zhang
Original Paper

Abstract

We describe a glassy carbon electrode (GCE) modified with a film composed of Nafion and TiO2-graphene (TiO2-GR) nanocomposite, and its voltammetric response to the amino acids L-tryptophane (Trp) and L-tyrosine (Tyr). The incorporation of TiO2 nanoparticles with graphene significantly improves the electrocatalytic activity and voltammetric response compared to electrodes modified with Nafion/graphene only. The Nafion/TiO2-GR modified electrode was used to determine Trp and Tyr with detection limits of 0.7 and 2.3 μM, and a sensitivity of 75.9 and 22.8 μA mM−1 for Trp and Tyr, respectively.

Figure

The electrochemical sensor based on Nafion/TiO2-GR composite film modified GCE was presented. The integration of TiO2 nanoparticles with graphene provides an efficient microenvironment to promote the electrochemical reaction of amino acids Trp and Tyr. The fabricated electrochemical sensor exhibits favorable analytical performance for Trp and Tyr, with high sensitivity, low detection limit and good reproducibility.

Keywords

Graphene TiO2-graphene nanocomposite Electrochemical sensor Tryptophan Tyrosine 

Notes

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 21002082) and the Key Project of Chinese Ministry of Education (No. 210129).

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Yang Fan
    • 1
    Email author
  • Jin-Hang Liu
    • 1
  • Hai-Ting Lu
    • 1
  • Qin Zhang
    • 1
  1. 1.College of Chemistry and Chemical EngineeringXinyang Normal UniversityXinyangPeople’s Republic of China

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