Vortex-assisted magnetic dispersive solid-phase microextraction for rapid screening and recognition of dicofol residues in tea products

• Published in: Food chemistry Vol. 162; pp. 104 - 109
• Main Authors: Cheng, Xiaoling, Yan, Hongyuan, Wang, Xiaoling, Sun, Ning, Qiao, Xiaoqiang
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.11.2014; Elsevier
• Subjects: Biological and medical sciences; Chromatography, Gas - methods; Chromatography, Liquid - methods; Coffee, tea and other stimulative beverage industries; Column liquid chromatography; Dicofol; Dicofol - chemistry; Dummy molecularly imprinted microspheres; Food industries; Food toxicology; Fundamental and applied biological sciences. Psychology; Magnetic dispersive solid-phase microextraction; Magnetic Phenomena; Medical sciences; Solid Phase Microextraction - methods; Tea - adverse effects; Tea - chemistry; Tea products; Toxicology; Column liquid chromatography; Dicofol; Magnetic dispersive solid-phase microextraction; Tea products; Dummy molecularly imprinted microspheres; Magnetic dispersive solid-phase; microspheres; Liquid chromatography; microextraction; Medical screening; Solid; Genomic imprinting; Screening; Tea; Analysis method; Residue; Column chromatography; Dummy molecularly imprinted; Recognition
• ISSN: 0308-8146; 1873-7072
• DOI: 10.1016/j.foodchem.2014.04.023

•Simple and rapid vortex-assisted magnetic dispersive solid-phase microextraction.•Magnetic dummy imprinted microspheres synthesised by aqueous suspension polymerisation.•Selective screening and recognition of dicofol in tea products.•Extraction efficiency was markedly increased with reduced equilibrium time. 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 0.2–160ngg−1 and the limit of detection based on a signal to noise ratio of 3 was 0.05ngg−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.