title: Synthesis of multi-core-shell magnetic molecularly imprinted microspheres for rapid recognition of dicofol in tea.
abstract: Magnetic multi-core-shell molecularly imprinted microspheres (Fe3O4@MIMs) based on multi-Fe3O4 nanoparticles as core structures and dummy imprinted materials as shell structures have been synthesized by a surface-imprinted technique using dichlorodiphenyltrichloroethane as the dummy template and were successfully used as a specific adsorbent for rapid isolation of trace levels of dicofol from teas. The resulting Fe3O4@MIMs were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, vibrating sample magnetometer, and thermogravimetric analysis. In comparison to the imprinted polymers prepared by the traditional polymerizations, the obtained Fe3O4@MIMs showed regularly spherical shape, porous morphologies, high saturation magnetization [56.8 electromagnetic units (emu)/g], and rapid response time (15 s). The as-synthesized Fe3O4@MIMs, which incorporated the excellent molecular recognition and magnetic separation properties, were successfully used as special adsorbents for rapid isolation and extraction of trace levels of dicofol and its analogues from a complicated tea matrix.
authors: Key Laboratory of Pharmaceutical Quality Control of Hebei Province and College of Pharmacy, Hebei University , Baoding 071002, People's Republic of China.
authors: Hongyuan
authors: H
authors: Yan
authors: Xiaoling
authors: X
authors: Cheng
authors: Ning
authors: N
authors: Sun
mesh_terms: D000327:Adsorption; D004010:Dicofol / Q000737:chemistry*; D005506:Food Contamination / Q000032:analysis* / Q000517:prevention & control; D060328:Magnetic Phenomena; D008863:Microspheres; D054802:Molecular Imprinting; D010575:Pesticides / Q000737:chemistry*; D058105:Polymerization; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013662:Tea / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D010575:Pesticides; D011108:Polymers; D013662:Tea; D004010:Dicofol