• Fulltext


        Click here to view fulltext PDF

      Permanent link:

    • Keywords


      ZnO nanorods; PT–ZnO nanocomposite; electrostatic interaction; L-tryptophan; electrochemical biosensor; peanut extract.

    • Abstract


      Electrostatically fused nanocomposite of zinc oxide (ZnO) nanorods affixed with polythiophene (PT) was successfully illustrated for effective voltammetric biosensing of L-tryptophan (L-Try) in this work. Structural characterization confirms the in-situ composite formation of PT @ ZnO and its BET analysis reveals the porous nature of as-synthesized material having the specific surface area of 4.953 m$^2$ g$^{–1}$ and average pore diameter of 2.153 nm, respectively. PT @ ZnO exhibits superior electrochemical performance towards L-Try in phosphate buffer solution of pH 7 by the movement of fast electron-transfer rate because of effective interaction between indole group of L-Try and PT @ ZnO nanocomposite. That is, the sulphur group in PT easily attached with the amine group of L-Try demonstrated the linear increase of peak current with increasing concentration in the range of L-Try 100 nM$^{–1}$ mM having detection limit of 8.5 nM. The invented biosensor shows extraordinary selectivity among other physiological substances and also exposes high stability, repeatability and reproducibility. The practical utility of PT-ZnO/glassy carbon electrode tested with the concentration of L-Try in peanut extract showed preferable results.

    • Graphical Abstract


    • Author Affiliations



      1. Department of Physics, Raja Doraisingam Government Arts College, Affiliated to Alagappa University, Karaikudi 630 561, India
      2. Department of Bioelectronics and Biosensors, Alagappa University, Karaikudi 630 001, India
    • Dates

    • Supplementary Material

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2023-2024 Indian Academy of Sciences, Bengaluru.