title: [Determination of low-level pesticide residues in agricultural products by ion-trap GC/MS/MS].
abstract: The objective of this study was to elucidate the utility of ion-trap GC/MS/MS for the analysis of pesticides in extracted matrices from various agricultural products. Identification and quantitative analysis of pesticides in matrices were performed by quadrupole GC/MS and ion-trap GC/MS/MS. Chlorpyrifos was added to the matrix of spinach, soybean in the pod or corn, and aldrin, dieldrin, endrin, alpha-BHC, beta-BHC, gamma-BHC, delta-BHC, p,p'-DDD, p,p'-DDE, o,p'-DDT and p,p'-DDT were added to each matrix of green tea, black tea or oolong tea. Although most of the pesticides in the matrix could not be determined by quadrupole GC/MS-Scan analysis at 0.1 microgram/mL, every pesticide was identified from the mass spectrum using ion-trap GC/MS/MS at the same concentration. The quantitation limit of every pesticide in each matrix by ion-trap GC/MS/MS analysis was higher than that by GC/MS-SIM analysis. The calibration curves obtained by GC/MS/MS were linear in the range of 0.01-0.25 microgram/mL of each pesticide. The recoveries of each pesticide from four kinds of samples spiked at the levels of 0.01 ppm to 0.02 ppm in extracts were 61.2-138.3% with SD values in the range from 1.2 to 15.4%. This study revealed that ion-trap GC/MS/MS was useful for the identification and quantitative analysis of low-level pesticides residues in matrices of agricultural products.
authors.affiliation: Kobe Quarantine Station, Center for Inspection of Imported Foods and Infectious Diseases: 1-1, Toyahama-cho, Hyogo-ku, Kobe 652-0866, Japan.
authors.forename: Tomoko
authors.initials: T
authors.lastname: Inoue
authors.forename: Saori
authors.initials: S
authors.lastname: Sasaki
authors.forename: Seiji
authors.initials: S
authors.lastname: Uchikawa
authors.forename: Yoshichika
authors.initials: Y
authors.lastname: Hirahara
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Shiomi
authors.forename: Yasuhide
authors.initials: Y
authors.lastname: Tonogai
mesh_terms: D018556:Crops, Agricultural / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D010573:Pesticide Residues / Q000032:analysis*
chemical_list: D010573:Pesticide Residues