Abstract
We describe an electrochemical sensor for L-cysteine that is based on the use of Y2O3 nanoparticles (Y2O3-NPs) supported on nitrogen-doped reduced graphene oxide (N-rGO). The material was characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and electrochemical methods. Deposited on a carbon paste electrode, the material displays a strongly oxidation peak for L-cysteine at pH 7.0 (compared to an unmodified electrode). The current, measured at a potential 0.7 V (vs. Ag/AgCl), increases linearly in the 1.3 to 720 μM L-cysteine concentration range, and the detection limit is 0.8 μM. The sensor was successfully applied to the determination L-cysteine in spiked syrup.
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Acknowledgments
The authors gratefully acknowledge the financial support from Nature Science Foundation of Anyang Normal University and National Natural Science Foundation of China (NSFC, No. 21102005).
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Yang, S., Li, G., Wang, Y. et al. Amperometric L-cysteine sensor based on a carbon paste electrode modified with Y2O3 nanoparticles supported on nitrogen-doped reduced graphene oxide. Microchim Acta 183, 1351–1357 (2016). https://doi.org/10.1007/s00604-015-1737-8
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DOI: https://doi.org/10.1007/s00604-015-1737-8