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Core-shell magnetic molecularly imprinted polymer nanoparticles for the extraction of triazophos residues from vegetables

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Abstract

The authors report on a surface molecular imprinting strategy for synthesizing magnetic and molecularly imprinted core-shell polymer nanoparticles (MMIPs) with a typical size of 320 nm. The triazophos-imprinted polymer shell on 180-nm magnetite particles (modified with 3-methacryloxypropyl trimethoxysilane) was obtained by radical polymerization of ethylene glycol dimethacrylate in the presence of triazophos, this followed by extractive removal of triazophos. The resulting MMIPs possess large binding capacity, high recognition selectivity, and fast binding kinetics for triazophos. They can be easily separated from a solution by using a magnet. These features result in a convenient and selective solid-phase extraction procedure for triazophos prior to its determination by UV spectrometry or by GC analysis. The method was successfully applied to the extraction and clean-up of triazophos residues in spiked homogenates of vegetables with recoveries in the range of 89.2 ~ 99.0%. The detection limits for triazophos by the UV assay and GC assay are 0.93 nM and 0.32 nM, respectively.

The core-shell magnetic molecularly imprinted polymer nanoparticles (MMIPs) with a nanoscale triazophos-imprinted polymer shell were prepared by surface imprinting onto the surfaces of 3-methacryloxypropyl trimethoxysilane (MATS) modified Fe3O4 magnetic nanoparticles. They were successfully applied for the extraction and clean-up of ultra trace triazophos residues in spiked homogenates of vegetable samples. MMIPs exhibit the larger binding capacity, faster binding kinetics, higher recognition selectivity, good reusability and stability, and excellent magnetic responses.

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Acknowledgements

This work was supported by the Science and Technology Project of Anhui Province (nos. 1406c085021 and 1606c08229) and Key projects of Natural Science Research of Anhui Province (no. KJ2016A741).

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Authors and Affiliations

  1. Key Laboratory of Biomimetic Sensor and Detecting Technology of Anhui Province, School of Materials and Chemical Engineering, West Anhui University, Lu’an, Anhui, 237012, China

    Huaifen Li, Tao Xie, Lingling Ye, Yanwei Wang & Chenggen Xie

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  1. Huaifen Li
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  2. Tao Xie
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Correspondence to Chenggen Xie.

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Li, H., Xie, T., Ye, L. et al. Core-shell magnetic molecularly imprinted polymer nanoparticles for the extraction of triazophos residues from vegetables. Microchim Acta 184, 1011–1019 (2017). https://doi.org/10.1007/s00604-017-2096-4

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