Abstract
The paper describes the preparation of a fluorescent probe based on the use of up-conversion particles (UCPs) of the type NaYF4: Er, Yb and shelled with a molecularly imprinted polymer (MIP) that is specific for the antibiotic enrofloxacin. The upconverted green luminescence emitted by the UCPs upon photoexcitation at 980 nm was used to locally generate a thin MIP shell around the UCPs via photopolymerization. Enrofloxacin is used as the template, and ethylene glycol dimethacrylate (EGDMA) as the cross-linking agent. It is found that enrofloxacin is well captured by the MIP and then quenches the fluorescence of the UCPs. Fluorescence decreases linearly in the 63 ng·L−1 to 60 μg·L−1 enrofloxacin concentration range, with a 8 ng·L−1 limit of detection. The method was applied to the determination of enrofloxacin in spiked fish samples. Recoveries ranged from 83.7 to 87.7%, with relative standard deviations between 2.0 and 5.5% (for n = 3).
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This work was financially supported by the National Natural Science of China (Grant No. 31201370) and the Graduate Innovation Foundation of Bohai University (071502224-49).
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Tang, Y., Li, M., Gao, X. et al. A NIR-responsive up-conversion nanoparticle probe of the NaYF4:Er,Yb type and coated with a molecularly imprinted polymer for fluorometric determination of enrofloxacin. Microchim Acta 184, 3469–3475 (2017). https://doi.org/10.1007/s00604-017-2387-9
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DOI: https://doi.org/10.1007/s00604-017-2387-9