Abstract
A strategy was developed for the voltammetric determination of the antibiotic drug levofloxacin (LV) based on a glassy carbon electrode modified with a composite consisting of poly(o-aminophenol) and graphene quantum dots (PoAP/GQD) that was fabricated by electropolymerization. The PoAP/GQD composite provides a large surface area and sensing interface and strongly promotes the oxidation current of LV. Under optimal conditions, the modified GCE displays an oxidation peak current (best measured at a working voltage of 1.05 V vs. SCE) that is linearly related to the levofloxacin concentration in the range from 0.05 to 100 μM, and the detection limit is 10 nM (at an S/N of 3). The method was applied to the determination of levofloxacin in spiked milk samples where is gave recoveries between 96.0 and 101.0 %.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Nos. 21405035, 21475032), the Natural Science Fund for Creative Research Groups of Hubei Province of China (No. 2014CFA015), the Open Project Program of State Key Laboratory of Chemo/Biosensing and Chemometrics (No. Z2015021), and the Hubei Key Laboratory of Pollutant Analysis & Reuse Technology (No. KL2013M09).
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Huang, JY., Bao, T., Hu, TX. et al. Voltammetric determination of levofloxacin using a glassy carbon electrode modified with poly(o-aminophenol) and graphene quantum dots. Microchim Acta 184, 127–135 (2017). https://doi.org/10.1007/s00604-016-1982-5
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DOI: https://doi.org/10.1007/s00604-016-1982-5