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Reference type: Journal
Authors: Su XM, Li XY, Li JJ, Liu M, Lei FH, Tan XC, Li PF, Luo WQ
Article Title: Synthesis and characterization of core-shell magnetic molecularly imprinted polymers for solid-phase extraction and determination of Rhodamine B in food.
Publication date: 2015
Journal: Food Chemistry
Volume: 171
Page numbers: 292-297.
DOI: 10.1016/j.foodchem.2014.09.024
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0308814614013910

Abstract: 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%
Template and target information: Rhodamine B
Author keywords: Core-shell magnetic nanoparticles, Molecularly imprinted polymers, Solid-phase extraction, Rhodamine B, food

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