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A core-shell surface magnetic molecularly imprinted polymers with fluorescence for λ-cyhalothrin selective

Lin Gao1, Jixiang Wang, Xiuying Li

  • 1School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, China.

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|September 10, 2014
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We developed magnetic core-shell polymers for detecting trace λ-cyhalothrin. This method offers sensitive and selective optical detection of the pesticide in food samples like honey.

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Polymer Science

Background:

  • Trace pesticide detection is crucial for food safety.
  • Developing selective and sensitive analytical tools is essential for monitoring λ-cyhalothrin residues.

Purpose of the Study:

  • To create a general protocol for core-shell magnetic Fe3O4/SiO2-MPS/MIPs (molecularly imprinted polymers).
  • To enable optical detection of trace λ-cyhalothrin using a surface molecular imprinting technique.

Main Methods:

  • Synthesized Fe3O4/SiO2-MPS as the core and MIPs as the shell via surface molecular imprinting.
  • Prepared a fluorescent MIP shell by copolymerization with allyl fluorescein in the presence of λ-cyhalothrin.
  • Utilized fluorescence quenching for optical detection.

Main Results:

  • The Fe3O4/SiO2-MPS/MIPs exhibited paramagnetism, high fluorescence, and selective recognition.
  • Successfully detected λ-cyhalothrin with high sensitivity and selectivity.
  • Established a linear relationship (0-50 nM, R²=0.9962) using fluorescence quenching.

Conclusions:

  • The developed magnetic Fe3O4/SiO2-MPS/MIPs are effective for trace λ-cyhalothrin determination in honey.
  • This study demonstrates the potential of MIPs for pesticide detection in food matrices.