title: Simultaneous determination of 16 pyrethroid residues in tea samples using gas chromatography and ion trap mass spectrometry.
abstract: Pyrethroids are widely used in tea production, and pesticide residues in brewed tea are becoming a major issue. Thus, an appropriate control method of pyrethroid residues in tea samples has to be developed and used to reduce the potential health hazard from consumption of pyrethroids. A method is described here for the simultaneous determination of 16 pyrethroid residues in tea samples. The insecticides were extracted using acetone and then underwent cleanup through a florisil column. Analysis was performed by gas chromatography with ion trap mass spectrometry (GC IT-MS) in MS MS mode. Retention time and specific ions were used for identification. Recoveries at spiked levels (0.001-0.2 μg/g) for the 16 pyrethroids ranged from 71.3% to 106.3%, and the coefficient of variation was less than 17% in each case. The limits of detection were from 0.001 to 0.05 μg/g. The proposed method was successfully applied to determine pyrethroid residues in 25 brewed made tea samples. It was found that there were bifenthrin, cyfluthrin, lamda-cyhalothrin, cypermethrin, dicofol, fenpropathrin, fenvalerate, fluvalinate, and tetramethrin residues in different samples with levels ranging from 1.18-3071.29 μg/kg.
authors.affiliation: State Key Laboratory of Food Science and Technology and School of Food Science and Technology, Jiangnan University, Wuxi, JiangSu, 214122, China. echokh@yahoo.cn
authors.forename: Hua
authors.initials: H
authors.lastname: Kuang
authors.forename: Hong
authors.initials: H
authors.lastname: Miao
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Hou
authors.forename: Yunfeng
authors.initials: Y
authors.lastname: Zhao
authors.forename: Yongning
authors.initials: Y
authors.lastname: Wu
authors.forename: Chuanlai
authors.initials: C
authors.lastname: Xu
mesh_terms: D000096:Acetone; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D010573:Pesticide Residues / Q000032:analysis*; D011722:Pyrethrins / Q000032:analysis*; D012680:Sensitivity and Specificity; D013662:Tea / Q000737:chemistry*
chemical_list: D010573:Pesticide Residues; D011722:Pyrethrins; D013662:Tea; D000096:Acetone