title: Simultaneous determination of nine trace organophosphorous pesticide residues in fruit samples using molecularly imprinted matrix solid-phase dispersion followed by gas chromatography.
abstract: 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.
authors.affiliation: College of Food Science and Engineering, Shandong Agricultural University , Tai'an 271018, People's Republic of China.
authors.forename: Xilong
authors.initials: X
authors.lastname: Wang
authors.forename: Xuguang
authors.initials: X
authors.lastname: Qiao
authors.forename: Yue
authors.initials: Y
authors.lastname: Ma
authors.forename: Tao
authors.initials: T
authors.lastname: Zhao
authors.forename: Zhixiang
authors.initials: Z
authors.lastname: Xu
mesh_terms: D000327:Adsorption; D002849:Chromatography, Gas / Q000379:methods*; D003432:Cross-Linking Reagents; D005506:Food Contamination / Q000032:analysis*; D005638:Fruit / Q000737:chemistry*; D008689:Methacrylates; D054802:Molecular Imprinting / Q000379:methods*; D009943:Organophosphorus Compounds / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D011108:Polymers
chemical_list: D003432:Cross-Linking Reagents; D008689:Methacrylates; D009943:Organophosphorus Compounds; D010573:Pesticide Residues; D011108:Polymers; C004919:ethylene dimethacrylate