Abstract
In this work, zinc oxide (ZnO) nanowires-based electrochemical biosensor is designed and fabricated for the detection of L-lactic acid. ZnO nanowires were successfully synthesized via the chemical vapor deposition method. The morphology and structure of the prepared products were characterized, and the average diameter of synthesized ZnO samples was 500 nm. The fluorescence characterization was performed to verify the immobilization of lactate oxidase onto the ZnO surface. Biosensors based on large-area ZnO nanowires were then constructed, and a series of electrochemical experiments showed that ZnO could provide the efficient electron transfer channel between the enzymic active sites and the electrode surface. The proposed electrochemical biosensor exhibited a sensitivity of 15.6 µA cm−2 mM−1, a wide linear range of 12 µM–1.2 mM with a low-detection limit of 12 µM for L-lactic acid detection. This study has indicated the potential applications for ZnO nanowires to construct the simple and economic nano-bio devices for the detection of biological species.
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Acknowledgments
This work was supported by the National Major Research Program of China (2013CB932600), Major Project of International Cooperation and Exchanges (2012DFA50990), the National Natural Science Foundation of China (51232001, 51172022, 51372023), the Research Fund of Co-construction Program from Beijing Municipal Commission of Education, the Fundamental Research Funds for the Central Universities, the Program for Changjiang Scholars and Innovative Research Team in University.
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Zhao, Y., Yan, X., Kang, Z. et al. Zinc oxide nanowires-based electrochemical biosensor for L-lactic acid amperometric detection. J Nanopart Res 16, 2398 (2014). https://doi.org/10.1007/s11051-014-2398-y
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DOI: https://doi.org/10.1007/s11051-014-2398-y