Molecularly Imprinted Polymer as Sorbent for Solid-Phase Extraction Coupling to Gas Chromatography for the Simultaneous Determination of Trichlorfon and Monocrotophos Residues in Vegetables

作者：Xin, Junhong; Qiao, Xuguang; Xu, Zhixiang^*; Zhou, Jie

来源：Food Analytical Methods, 2013, 6(1): 274-281.

DOI：10.1007/s12161-012-9432-4

• Molecular imprinting
• Mixed template
• Organophosphate pesticides
• Solid-phase extraction
• Gas chromatography

In this study, a molecularly imprinted polymer (MIP) was prepared using the mixture of trichlorfon and monocrotophos as the mixed template. The imprinted polymer was characterized and exhibited good recognition ability and fast adsorption-desorption dynamic toward the trichlorfon and monocrotophos. Using this imprinted polymer as sorbent, a new method of molecularly imprinted solid-phase extraction coupled to gas chromatography for the simultaneous determination of two organophosphate pesticides residues was developed. Under optimal condition, the linear range was 0.005-10.0 mg/l. At a loading flow rate of 2.0 ml/min for loading 100 ml, the detection limits were 0.28 mu g/l for trichlorfon and 0.090 mu g/l for monocrotophos, the peak area precision (RSD) for five replicates was 4.23-4.50 %. The blank rape samples spiked with two organophosphate pesticides at 0.05 and 0.1 mg/l levels were determined by this method with recoveries ranging from 89.41 % to 95.12 %. Moreover, this method was successfully applied to the quantitative detection of the trichlorfon and monocrotophos residues in leek samples.

• 出版日期2013-2
• 单位山东农业大学