Synthesis and characterization of core-shell magnetic molecularly imprinted polymers for solid-phase extraction and determination of Rhodamine B in food

卷:171

Su, Xiaomeng ; Li, Xiaoyan ; Li, Junjie ; Liu, Min ; Lei, Fuhou ; Tan, Xuecai ; Li, Pengfei ; Luo, Weiqiang

关键词: Core-shell magnetic nanoparticles;    Molecularly imprinted polymers;    Solid-phase extraction;    Rhodamine B;    Food;   

DOI  :  10.1016/j.foodchem.2014.09.024

学科分类：食品科学和技术

【 摘 要 】

Core-shell magnetic molecularly imprinted polymers (MIPs) nanoparticles (NPs), in which a Rhodamine B-imprinted layer was coated on Fe3O4 NPs. were synthesized. First, Fe3O4 NPs were prepared by a coprecipitation method. Then, amino-modified Fe3O4 NPs (Fe3O4 @SiO2-NH2) was prepared. Finally, the MIPs were coated on the Fe3O4@SiO2-NH2 surface by the copolymerization with functional monomer, acrylamide, using a cross-linking agent, ethylene glycol dimethacrylate; an initiator, azobisisobutyronitrile and a template molecule, Rhodamine B. The Fe3O4@MIPs were characterized using a scanning electron microscope, Fourier transform infrared spectrometer, vibrating sample magnetometer, and re-binding experiments. The Fe3O4@MIPs showed a fast adsorption equilibrium, a highly improved imprinting capacity, and significant selectivity; they could be used as a solid-phase extraction material and detect illegal addition Rhodamine B in food. A method was developed for the selective isolation and enrichment of Rhodamine B in food samples with recoveries in the range 78.47-101.6% and the relative standard deviation was <2%. (C) 2014 Elsevier Ltd. All rights reserved.