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Preparation and characterization of magnetic molecular imprinted polymers with ionic liquid for the extraction of carbaryl in food

Abstract

Magnetic molecular imprinted polymers with ionic liquid used as an auxiliary solvent (IL@MMIPs) for the recognition of the methyl carbamate pesticide carbaryl (CBR) in foodstuff have been synthesized. The properties and application of IL@MMIPs were determined. The kinetic and isotherm adsorption processes were found to follow the pseudo-second-order and the Scatchard models, respectively. The selective experiment showed that the IL@MMIPs exhibited good selectivity to CBR compared to magnetic nonimprinted polymers with IL (IL@MNIPs). By using the IL@MMIPs as an adsorbent for the enrichment of CBR in food samples, the limit of detection (LOD, S/N = 3) and the limit of quantitation (LOQ, S/N = 10) of this method were 3 μg kg−1 and 10 μg kg−1, respectively. Compared with the traditional method, the IL@MMIP method has better recoveries (83.23–99.83%), precision (1.12–2.09%), and stabilization (intraday, 1.08–2.81%; interday, 2.26–3.30%). IL@MMIPs are an ideal adsorbent that could be applied to conveniently detect CBR in complex food, and the proposed method can be considered as a selective and sensitive alternative to traditional methods with affordable cost, avoiding the complex pretreatment procedure.

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Acknowledgments

This work was sponsored by the Project Technology Innovation Research and Development of Chengdu Science and Technology Bureau [2018-YF05-00765-SN], Chengdu Technological Innovation Research and Development Project [2019-YF05-00823-SN], Foundation of Innovation Software Engineering for Young People in Sichuan [2019100], National Natural Science Foundation of China [31671954], and Student’s Platform for Innovation and Entrepreneurship Training Program [201810626003].

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Correspondence to Shujuan Chen.

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Chen, S., Fu, J., Fu, Z. et al. Preparation and characterization of magnetic molecular imprinted polymers with ionic liquid for the extraction of carbaryl in food. Anal Bioanal Chem 412, 1049–1062 (2020). https://doi.org/10.1007/s00216-019-02330-y

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Keywords

  • Analytical method
  • Magnetic molecular imprinted polymers
  • Carbaryl
  • Liquid chromatography
  • Ionic liquid