title: Synthesis and characterization of core-shell magnetic molecularly imprinted polymers for solid-phase extraction and determination of Rhodamine B in food.
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%.
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Key Laboratory of Chemistry and Engineering of Forest Products, Nanning, Guangxi 530008, China.
authors.forename: Xiaomeng
authors.initials: X
authors.lastname: Su
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Key Laboratory of Chemistry and Engineering of Forest Products, Nanning, Guangxi 530008, China. Electronic address: lixiaoyan73515@163.com.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University, Nanning, Guangxi 530004, China.
authors.forename: Junjie
authors.initials: J
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Key Laboratory of Chemistry and Engineering of Forest Products, Nanning, Guangxi 530008, China.
authors.forename: Min
authors.initials: M
authors.lastname: Liu
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Key Laboratory of Chemistry and Engineering of Forest Products, Nanning, Guangxi 530008, China.
authors.forename: Fuhou
authors.initials: F
authors.lastname: Lei
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Key Laboratory of Chemistry and Engineering of Forest Products, Nanning, Guangxi 530008, China.
authors.forename: Xuecai
authors.initials: X
authors.lastname: Tan
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Key Laboratory of Chemistry and Engineering of Forest Products, Nanning, Guangxi 530008, China.
authors.forename: Pengfei
authors.initials: P
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Key Laboratory of Chemistry and Engineering of Forest Products, Nanning, Guangxi 530008, China.
authors.forename: Weiqiang
authors.initials: W
authors.lastname: Luo
mesh_terms: D000327:Adsorption; D005502:Food; D005504:Food Analysis / Q000379:methods*; D008280:Magnetics; D058185:Magnetite Nanoparticles / Q000737:chemistry; D008689:Methacrylates; D008855:Microscopy, Electron, Scanning; D054802:Molecular Imprinting; D053758:Nanoparticles / Q000737:chemistry; D058105:Polymerization; D011108:Polymers / Q000737:chemistry*; D012235:Rhodamines / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D052616:Solid Phase Extraction / Q000379:methods*; D012997:Solvents; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D058185:Magnetite Nanoparticles; D008689:Methacrylates; D011108:Polymers; D012235:Rhodamines; D012997:Solvents; C026188:rhodamine 6G; D012822:Silicon Dioxide; C004919:ethylene dimethacrylate; C029773:rhodamine B
keywords: Core–shell magnetic nanoparticles; Food; Molecularly imprinted polymers; Rhodamine B; Solid-phase extraction