Simultaneous Determination of Nine Trace Organophosphorous Pesticide Residues in Fruit Samples Using Molecularly Imprinted Matrix Solid-Phase Dispersion Followed by Gas Chromatography

How to determine trace multipesticide residues in fruits is an important problem. This paper reports a molecularly imprinted polymer (MIP) that was prepared using 4-(dimethoxyphosphorothioylamino)butanoic acid as the template, acrylamide as the functional monomer, and ethylene glycol dimethacryla...

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Bibliographic Details
Published in:	Journal of agricultural and food chemistry 2013-04, Vol.61 (16), p.3821-3827
Main Authors:	Wang, Xilong, Qiao, Xuguang, Ma, Yue, Zhao, Tao, Xu, Zhixiang
Format:	Article
Language:	eng
Subjects:	acephate Adsorption apples Biological and medical sciences Chromatography, Gas - methods Cross-Linking Reagents dimethoate ethylene glycol Food Contamination - analysis Food industries Fruit - chemistry Fruit and vegetable industries fruits Fundamental and applied biological sciences. Psychology gas chromatography malathion Methacrylates methamidophos Molecular Imprinting - methods monocrotophos omethoate Organophosphorus Compounds - analysis parathion-methyl pears pesticide residues Pesticide Residues - analysis phosphamidon Polymers solid phase extraction trichlorfon
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Summary:	How to determine trace multipesticide residues in fruits is an important problem. This paper reports a molecularly imprinted polymer (MIP) that was prepared using 4-(dimethoxyphosphorothioylamino)butanoic acid as the template, acrylamide as the functional monomer, and ethylene glycol dimethacrylate (EGDMA) as the cross-linker. The novel imprinted polymer was characterized by static and kinetic adsorption experiments, and it exhibited good recognition ability and fast adsorption–desorption dynamicd toward trichlorfon, malathion, acephate, methamidophos, omethoate, dimethoate, phosphamidon, monocrotophos, and methyl parathion. Using this imprinted polymer as sorbent, matrix solid-phase dispersion coupled to gas chromatography for simultaneous determination of nine trace organophosphorus pesticide residues was first presented. Under the optimized conditions, the LOD (S/N = 3) of this method for the nine organophosphorus was 0.3–1.6 μg kg–1; the RSD for three replicate extractions ranged from 1.2 to 4.8%. The apple and pear samples spiked with nine organophosphate pesticides at levels of 20 and 100 μg kg–1 were determined according to this method with good recoveries ranging from 81 to 105%. Moreover, this developed method was successfully applied to the quantitative detection of the nine organophosphorus pesticide residues in orange samples.
ISSN:	0021-8561 1520-5118