期刊
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
卷 406, 期 28, 页码 7213-7220出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-014-8126-8
关键词
Polymers; Optical sensors; Fluorescence/luminescence
资金
- National Natural Science Foundation of China [21107037, 21176107, 21277063]
- Natural Science Foundation of Jiangsu Province [BK2011461, BK2011514]
- National Postdoctoral Science Foundation [2013 M530240]
- Postdoctoral Science Foundation [1202002B]
- Programs of Senior Talent Foundation of Jiangsu University [12JDG090]
- Ph.D. Innovation Programs Foundation of Jiangsu Province [CXZZ13_0681]
In this study, we report here a general protocol for making core-shell magnetic Fe3O4/SiO2-MPS/MIPs (MPS = 3-(methacryloxyl) propyl trimethoxysilane, MIPs = molecularly imprinted polymers, Fe3O4/SiO2-MPS as core, MIPs as shell) via a surface molecular imprinting technique for optical detection of trace lambda-cyhalothrin. The fluorescent molecularly imprinted polymer shell was first prepared by copolymerization of acrylamide with a small quantity of allyl fluorescein in the presence of lambda-cyhalothrin to form recognition sites without doping. The magnetic Fe3O4/SiO2-MPS/MIPs exhibited paramagnetism, high fluorescence intensity, and highly selective recognition. Using fluorescence quenching as a detecting tool, Fe3O4/SiO2-MPS/MIPs were successfully applied to selectively and sensitively detect lambda-cyhalothrin, and a linear relationship could be obtained covering a wide concentration range of 0-50 nM with a correlation coefficient of 0.9962 described by the Stern-Volmer equation. The experimental results of practical detection revealed that magnetic Fe3O4/SiO2-MPS/MIPs as an attractive recognition element was satisfactory for determination of trace lambda-cyhalothrin in honey samples. This study, therefore, demonstrated the potential of MIPs for detection of lambda-cyhalothrin in food.
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