title: A core-shell surface magnetic molecularly imprinted polymers with fluorescence for λ-cyhalothrin selective recognition.
abstract: 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 λ-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 λ-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 λ-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 λ-cyhalothrin in honey samples. This study, therefore, demonstrated the potential of MIPs for detection of λ-cyhalothrin in food.
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Gao
authors.forename: Jixiang
authors.initials: J
authors.lastname: Wang
authors.forename: Xiuying
authors.initials: X
authors.lastname: Li
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Yan
authors.forename: Chunxiang
authors.initials: C
authors.lastname: Li
authors.forename: Jianming
authors.initials: J
authors.lastname: Pan
mesh_terms: D015374:Biosensing Techniques; D005290:Ferric Compounds / Q000737:chemistry; D005453:Fluorescence; D005456:Fluorescent Dyes; D006722:Honey / Q000032:analysis*; D008280:Magnetics; D054802:Molecular Imprinting; D053758:Nanoparticles / Q000737:chemistry*; D009570:Nitriles / Q000032:analysis*; D011108:Polymers / Q000737:chemistry*; D011722:Pyrethrins / Q000032:analysis*; D012822:Silicon Dioxide / Q000737:chemistry
chemical_list: D005290:Ferric Compounds; D005456:Fluorescent Dyes; D009570:Nitriles; D011108:Polymers; D011722:Pyrethrins; C000499:ferric oxide; D012822:Silicon Dioxide; C037304:cyhalothrin