title: A novel core-shell magnetic nano-sorbent with surface molecularly imprinted polymer coating for the selective solid phase extraction of dimetridazole.
abstract: 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 Al(3+) 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 OA9 (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%.
authors.affiliation: School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan 421001, China.
authors.forename: Canhui
authors.initials: C
authors.lastname: Hu
authors.affiliation: School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan 421001, China. Electronic address: jdeng_usc@163.com.
authors.forename: Jian
authors.initials: J
authors.lastname: Deng
authors.affiliation: School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan 421001, China.
authors.forename: Yubao
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan 421001, China.
authors.forename: Liangshu
authors.initials: L
authors.lastname: Xia
authors.affiliation: School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan 421001, China.
authors.forename: Kaihui
authors.initials: K
authors.lastname: Huang
authors.affiliation: School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan 421001, China.
authors.forename: Saiqin
authors.initials: S
authors.lastname: Ju
authors.affiliation: School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan 421001, China.
authors.forename: Ni
authors.initials: N
authors.lastname: Xiao
mesh_terms: D000818:Animals; D004131:Dimetridazole / Q000737:chemistry*; D060328:Magnetic Phenomena; D054802:Molecular Imprinting / Q000379:methods*; D011108:Polymers / Q000737:chemistry*; D052616:Solid Phase Extraction / Q000379:methods*; D013552:Swine
chemical_list: D011108:Polymers; D004131:Dimetridazole
keywords: Dimetridazole; Magnetic nano-sorbent; Sol–gel process; Surface molecularly imprinted polymer