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Reference type: Journal
Authors: Yan H, Sun N, Han YH, Yang C, Wang MY, Wu RJ
Article Title: Ionic liquid-mediated molecularly imprinted solid-phase extraction coupled with gas chromatography-electron capture detector for rapid screening of dicofol in vegetables.
Publication date: 2013
Journal: Journal of Chromatography A
Volume: 1307
Page numbers: 21-26.
DOI: 10.1016/j.chroma.2013.07.054
Alternative URL: http://www.sciencedirect.com/science/article/pii/S002196731301114X

Abstract: New ionic liquid-mediated molecularly imprinted polymers (IL-MIPs) were prepared by precipitation polymerization using 1-butyl-3-methylimidazolium hexafluorophosphate (BMIM+PF6-) as the auxiliary solvent, α-chloro-DDT as the dummy template, and they were successfully applied as the sorbents of solid-phase extraction (SPE) for rapid screening of dicofol from cabbage, tomato, and carrot samples. The IL-MIPs were characterized by FTIR, FE-SEM, static adsorption and chromatographic evaluation, and the results revealed that the IL-MIPs had higher adsorption capacity and selectivity to dicofol in aqueous solution than that of ionic liquid-mediated non-imprinted polymers (IL-NIPs) and non-imprinted polymers (NIPs). Under the optimized conditions, the IL-MIPs-SPE-GC method offered good linearity (0.4 - 40.0 ng g-1, r2 = 0.9995) and the average recoveries of dicofol at three spiked levels were in a range of 84.6 - 104.1% (n = 3) with RSD 7.6%. The proposed method obviously improved the selectivity and purification effect, and eliminated the effect of template leakage on dicofol quantitative analysis
Template and target information: dummy template, α-chloro-DDT, dicofol
Author keywords: Ionic liquid, Dummy imprinted polymers, Solid-phase extraction, Dicofol, vegetables


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