ZnO nanorods bonded polythiophene nanocomposite: an enhanced electrochemical voltammetric biosensing of L-tryptophan
S DHEEPTHI GUNAVATHANA S GIRIJA J WILSON A CYRAC PETER
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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.
S DHEEPTHI GUNAVATHANA1 S GIRIJA2 J WILSON2 A CYRAC PETER1
Volume 46, 2023
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Continuous Article Publishing mode
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
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