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Reference type: Journal
Authors: Yan HY, Yang C, Sun YY, Row KH
Article Title: Ionic liquid molecularly imprinted polymers for application in pipette-tip solid-phase extraction coupled with gas chromatography for rapid screening of dicofol in celery.
Publication date: 2014
Journal: Journal of Chromatography A
Volume: 1361
Page numbers: 53-59.
DOI: 10.1016/j.chroma.2014.07.102
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0021967314012072

Abstract: A new type of ionic liquid molecularly imprinted polymers (IL-MIPs) synthesized by precipitation polymerization using 1-allyl-3-methylimidazolium bromide as an auxiliary solvent and α-chloro-dichlorodiphenyltrichloroethane (α-chloro-DDT) as the template was applied as a selective sorbent of minimized pipette tip-solid-phase extraction (PT-SPE) for rapid isolation and extraction of dicofol (DCF) from celery samples. The pretreatment procedure of celery samples involved only 2.0 mg of IL-MIPs, 0.8 mL of acetonitrile-water (ACN-H2O; 1:1, v/v) (washing solvent), and 1.0 mL of acetone-10% acetic acid (HOAc) (elution solvent). Compared with molecularly imprinted polymers (MIPs), ionic liquid-non-imprinted polymers (IL-NIPs) and conventional sorbents such as C18, Si, NH2, and Al2O3-N, IL-MIPs showed higher adsorption and purification capacity to DCF in aqueous solution. Good linearity for DCF was observed in the range from 2.3 to 232.5 ng g-1 (r2 = 0.9995). The average recoveries at three spiking levels ranged from 86.6% to 101.9% with relative standard deviations (RSDs) of 6.5% (n = 3). The presented IL-MIPs-PT-SPE-GC/ECD method combines the advantages of MIPs, IL, and PT-SPE, and can be used in aqueous conditions with high affinity and selectivity to analytes of complex samples
Template and target information: α-chloro-dichlorodiphenyltrichloroethane, α-chloro-DDT
Author keywords: Ionic liquid, Molecularly imprinted polymers, Pipette tip-solid-phase extraction, Dicofol, Celery

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