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Reference type: Journal
Authors: Cheng XL, Yan HY, Wang XL, Sun N, Qiao XQ
Article Title: Vortex-assisted magnetic dispersive solid-phase microextraction for rapid screening and recognition of dicofol residues in tea products.
Publication date: 2014
Journal: Food Chemistry
Volume: 162
Page numbers: 104-109.
DOI: 10.1016/j.foodchem.2014.04.023
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0308814614005688

Abstract: A simple and rapid vortex-assisted magnetic dispersive solid-phase microextraction (VAMDSME) method coupled with gas chromatography-electronic capture detection was developed for rapid screening and selective recognition of dicofol in tea products. The magnetic molecularly imprinted microspheres (mag-MIMs) synthesised by aqueous suspension polymerisation using dichlorodiphenyltrichloroethane (DDT) as a dummy template showed high selectivity and affinity to dicofol in aqueous solution and were successfully applied as special adsorbents of VAMDSME for rapid isolation of dicofol from complex tea matrix. Good linearity was obtained in a range of 0.2-160 ng g-1 and the limit of detection based on a signal to noise ratio of 3 was 0.05 ng g-1. The recoveries at three spiked levels ranged from 83.6% to 94.5% with the related standard deviations (RSD) 5.0%. The VAMDSME-GC protocol, which took advantages of the selective adsorption of molecularly imprinted microspheres and rapid magnetic phase separation, as well as the short equilibrium time by vortex-assisted, could avoid the time-consuming procedures related to other traditional extraction methods
Template and target information: dichlorodiphenyltrichloroethane, DDT, dummy template, dicofol
Author keywords: Magnetic dispersive solid-phase microextraction, Dummy molecularly imprinted microspheres, column liquid chromatography, Dicofol, Tea products

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