title: Identification and quantitation of pyrethroid pesticide residues in vegetables by solid-phase extraction and liquid chromatography/electrospray ionization ion trap mass spectrometry.
abstract: A quantitative method consisting of solid-phase extraction (SPE) followed by liquid chromatography/electrospray ionization ion trap mass spectrometry (LC/ESI-ITMS) analysis was developed for the identification and quantitation of ten pyrethroid pesticides commonly used in vegetables. The best HPLC separation was achieved using a gradient program of methanol/water mixture. For the vegetable samples, an SPE procedure to clean up the matrices was carried out prior to LC/MS analysis. Under the optimum conditions, the limits of quantification of the pyrethroid pesticides (tetramethrin, allethrin, fenpropathrin, lambda-cyhalothrin, cypermethrin, deltamethrin, fenvalerate, bioresmethrin, permethrin and bifenthrin) ranged from 0.03 to 0.1 mg kg-1 with relative standard deviations<20%, and the mean recoveries ranged from 69.5 to 102.5%. The proposed method has been successfully applied to the determination of pyrethroids in six vegetables with satisfactory results.
authors.affiliation: Ministry of Education Key Laboratory of Analysis and Detection Technology for Food Safety, Department of Chemistry, Fuzhou University, Fuzhou, Fujian, 350002, China.
authors.forename: Tianwen
authors.initials: T
authors.lastname: Chen
authors.forename: Guonan
authors.initials: G
authors.lastname: Chen
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005506:Food Contamination / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D011722:Pyrethrins / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D014675:Vegetables / Q000737:chemistry*
chemical_list: D010573:Pesticide Residues; D011722:Pyrethrins