title: Analysis method study on 839 pesticide and chemical contaminant multiresidues in animal muscles by gel permeation chromatography cleanup, GC/MS, and LC/MS/MS.
abstract: The paper reports the study of gel permeation chromatography (GPC), gas chromatography/mass spectrometry (GS/MS), and column chromatography tandem MS (LC/MS/MS) for 839 pesticides and chemical contaminants, through which a GPC data bank has been established for 744 pesticides, a GC/MS data bank for 541 pesticides, and an LC/MS/MS data bank for 464 pesticides. On the basis of this study, a new method for quantitative determination of 587 pesticide residues in animal muscles such as beef, mutton, pork, chicken, and rabbit has been established using GPC cleanup followed by GC/MS and LC/MS/MS. In the method, 10 g animal samples were mixed with 20 g sodium sulfate and extracted twice with 35 mL cyclohexane-ethyl acetate (1 + 1) by blender homogenization followed by centrifugation, filtration, and concentration. An equivalent of 5 g sample was injected into a 400 x 25 mm S-X3 GPC column, with cyclohexane-ethyl acetate (1 + 1) as the mobile phase at a flow rate of 5 mL/min. The 22-40 min fraction was collected for subsequent analysis. For the 478 pesticides determined by GC/MS, the portions collected from GPC were concentrated to 0.5 mL and exchanged twice with 5 mL hexane. For the 379 pesticides determined by LC/MS/MS, the portions collected from GPC were dissolved with acetonitrile-water (60 + 40) after taking the extract to dryness with nitrogen gas. At the limit of quantification (LOQ) and 10 LOQ fortification levels of 0.1-16 000 microg/kg, recoveries were within 40-130%, among which 563 pesticide recoveries were between 60 and 130%, accounting for 96% of the compounds; 24 analytes were recovered between 40 and 60%, accounting for 4% of the compounds. The relative standard deviation was below 30% for all 587 pesticides. The limits of detection for the method were 0.1-1600 microg/kg. In comparison with GC/MS, LC/MS/MS increased the detection sensitivity 2-1000 times for 236 pesticides.
authors.affiliation: Qinhuangdao Entry-Exit Inspection and Quarantine Bureau, 39 Haibin Rd, Qinhuangdao, Hebei, People's Republic of China. qhdciqgfpang@yahoo.com.cn
authors.forename: Guo-Fang
authors.initials: GF
authors.lastname: Pang
authors.forename: Yan-Zhong
authors.initials: YZ
authors.lastname: Cao
authors.forename: Chun-Lin
authors.initials: CL
authors.lastname: Fan
authors.forename: Guang-Qun
authors.initials: GQ
authors.lastname: Jia
authors.forename: Jin-Jie
authors.initials: JJ
authors.lastname: Zhang
authors.forename: Xue-Min
authors.initials: XM
authors.lastname: Li
authors.forename: Yong-Ming
authors.initials: YM
authors.lastname: Liu
authors.forename: Yu-Qiu
authors.initials: YQ
authors.lastname: Shi
authors.forename: Zeng-Yin
authors.initials: ZY
authors.lastname: Li
authors.forename: Feng
authors.initials: F
authors.lastname: Zheng
authors.forename: Yu-Jing
authors.initials: YJ
authors.lastname: Lian
mesh_terms: D000818:Animals; D002850:Chromatography, Gel / Q000379:methods*; D002853:Chromatography, Liquid / Q000379:methods*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D009132:Muscles / Q000737:chemistry*; D010573:Pesticide Residues / Q000032:analysis*; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D010573:Pesticide Residues