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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.
Analytical and Bioanalytical Chemistry
|September 10, 2014
Summary
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.
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.
