A novel core-shell magnetic nano-sorbent with surface molecularly imprinted polymer coating for the selective solid phase extraction of dimetridazole

卷:158

Hu, Canhui ; Deng, Jian ; Zhao, Yubao ; Xia, Liangshu ; Huang, Kaihui ; Ju, Saiqin ; Xiao, Ni

Univ South China

关键词: Surface molecularly imprinted polymer;    Sol-gel process;    Dimetridazole;    Magnetic nano-sorbent;   

DOI  :  10.1016/j.foodchem.2014.02.143

学科分类：食品科学和技术

【 摘 要 】

A novel core-shell magnetic nano-sorbent with surface molecularly-imprinted polymer coating was prepared via a sol-gel process. Methyltrimethoxysilane and 3-aminopropyltriethoxysilane were used as functional monomers, tetraethyl orthosilicate as cross-linker, and Al3+ as dopant to generate Lewis acid sites in the silica matrix for the metal coordinate interactions with the template dimetridazole (DMZ). The ratios of the monomers, the dopant, and the cross-linker, were optimised by a OA(9) (3(4)) orthogonal array design. The resultant sorbent was characterised by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, powder X-ray diffraction, and magnetometry. The binding performances of the sorbent were evaluated by static, kinetic and selective adsorption experiments. The nano-sorbent was successfully applied to solid phase extraction followed by spectrophotometric determination of DMZ in real samples. Spiked recoveries ranged from 90.33% to 106.20% for egg, milk powder, and pig feed samples, with relative standard deviations of less than 4.54%. (C) 2014 Elsevier Ltd. All rights reserved.