Abstract
This paper describes the fabrication of an imprinted fluorescent nanoprobe based on SiO2-coated NaYF4: Yb, Er upconversion nanoparticles (UCNP) encapsulated with a molecularly imprinted polymer (MIP) for determination of acetamiprid. The fluorescent MIP nanoprobe was prepared using UCNP as the material for fluorescence signal readout, acetamiprid as template molecule, methylacrylic acid (MAA) as functional monomer, and ethyleneglycol dimethacrylate (EGDMA) as cross-linking agent. The molecular imprinting layers were immobilized on the surface of the UCNP@SiO2 by polymerization which occurred between the double bonds. UCNP@MIP shows a high selectivity towards acetamiprid with an imprinting factor (IF) of 7.84. When UCNP@MIP combines with acetamiprid, the fluorescence of the UCNP@MIP can be quenched due to the photo-induced electron transfer. Under optimum conditions, the fluorescence method shows a good linear relationship between the decreased fluorescence intensity (with excitation/emission peaks at 980/542 nm) and the variation of acetamiprid in the concentration range 20 to 800 ng mL−1. The limit of detection (LOD) is 8.3 ng mL−1. This fluorescence method was also successfully applied to detect acetamiprid in apple and strawberry samples. The recoveries range from 89.6 to 97.9%, with relative standard deviations between 1.6 and 2.9% (n = 5).
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Acknowledgments
This work was partially supported by Jiangsu Agriculture Science and Technology Innovation Fund (CX(18)2025), National Natural Science Fund of China (NSFC 31772086), Jiangsu Planned Projects for Postdoctoral Research Funds (1701097B), Fundamental Research Funds for the Central Universities JUSRP21826, and Young Elite Scientists Sponsorship Program by CAST (2017QNRC001).
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Yu, Q., He, C., Li, Q. et al. Fluorometric determination of acetamiprid using molecularly imprinted upconversion nanoparticles. Microchim Acta 187, 222 (2020). https://doi.org/10.1007/s00604-020-4204-0
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DOI: https://doi.org/10.1007/s00604-020-4204-0