title: Preparation of Magnetic Hollow Molecularly Imprinted Polymers for Detection of Triazines in Food Samples.
abstract: Novel magnetic hollow molecularly imprinted polymers (M-H-MIPs) were proposed for highly selective recognition and fast enrichment of triazines in food samples. M-H-MIPs were prepared on the basis of multi-step swelling polymerization, followed by in situ growth of magnetic Fe3O4 nanoparticles on the surface of hollow molecularly imprinted polymers (H-MIPs). Transmission electron microscopy and scanning electron microscopy confirmed the successful immobilization of Fe3O4 nanoparticles on the surface of H-MIPs. M-H-MIPs could be separated simply using an external magnet. The binding adsorption results indicated that M-H-MIPs displayed high binding capacity and fast mass transfer property and class selective property for triazines. Langmuir isotherm and pseudo-second-order kinetic models fitted the best adsorption models for M-H-MIPs. M-H-MIPs were used to analyze atrazine, simazine, propazine, and terbuthylazine in corn, wheat, and soybean samples. Satisfactory recoveries were in the range of 80.62-101.69%, and relative standard deviation was lower than 5.2%. Limits of detection from 0.16 to 0.39 μg L(-1) were obtained. When the method was applied to test positive samples that were contaminated with triazines, the results agree well with those obtained from an accredited method. Thus, the M-H-MIP-based dispersive solid-phase extraction method proved to be a convenient and practical platform for detection of triazines in food samples.
authors.affiliation: School of Chemistry and Chemical Engineering, Linyi University , Linyi, Shandong 276005, People's Republic of China.
authors.forename: Aixiang
authors.initials: A
authors.lastname: Wang
authors.affiliation: School of Chemistry and Chemical Engineering, Linyi University , Linyi, Shandong 276005, People's Republic of China.
authors.forename: Hongzhi
authors.initials: H
authors.lastname: Lu
authors.affiliation: School of Chemistry and Chemical Engineering, Linyi University , Linyi, Shandong 276005, People's Republic of China.
authors.forename: Shoufang
authors.initials: S
authors.lastname: Xu
mesh_terms: D000327:Adsorption; D005506:Food Contamination / Q000032:analysis*; D008280:Magnetics; D054802:Molecular Imprinting; D053758:Nanoparticles / Q000737:chemistry; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000295:instrumentation*; D014227:Triazines / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D011108:Polymers; D014227:Triazines
keywords: food sample; in situ growth; magnetic hollow MIPs; molecularly imprinted polymers; triazines