期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 442, 期 -, 页码 22-29出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2014.11.025
关键词
Stir bar sorptive extraction; Fe3O4@Polyaniline nanoparticles; Self-assembly; Magnetic field-induction; Molecularly imprinted polymers; Vanilla-flavor enhancers
资金
- National Natural Science Foundation of China [21175070, 81273480, 81202853]
- Natural Science Foundation of Jiangsu Province [BK2012444]
A molecularly imprinted stir bar was constructed based on Fe3O4@Polyaniline nanoparticles with magnetic field-induced self-assembly process. The monomer, methacrylic acid, was pre-assembled into the pre-polymers with vanillin as template by the formation of hydrogen bonds. After that, the magnetic complexes were generated by the hydrogen bonding, the hydrophobic and pi-pi interaction between the pre-polymers and Fe3O4@Polyaniline. The complexes were adsorbed on the surface of magnetic stir bar under the magnetic induction, and the coating of vanillin-molecularly imprinted polymers was generated by the one-step copolymerization basing on the cross linking of ethylene glycol dimethacrylate. The molecular imprinting stir bar showed superior selectivity and fast binding kinetics for vanillin, and was used for the enrichment of vanilla-flavor enhancers (vanillin, ethyl maltol and methyl vanillin) in infant milk powders. The results measured by HPLC-UV exhibited good linear ranges of 0.01-100, 0.02-100 and 0.03-100 mu g mL(-1) with the limit of detection of 2.5-10.0 ng mL(-1), and the recoveries were 94.7-98.9%, 82.1-96.7% and 84.5-93.2% with RSD < 7.2% for the three enhancers, respectively. (C) 2014 Elsevier Inc. All rights reserved.
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