title: [Determination of pesticides in Chinese dumplings using liquid chromatography-tandem mass spectrometry].
abstract: A rapid and easy multiresidue method for determination of pesticide residues in Chinese dumplings using liquid chromatography-tandem mass spectrometry (LC-MS/MS) has been developed. Pesticide residues were extracted with ethyl acetate in the presence of anhydrous magnesium sulfate in a disposable tube using a homogenizer. The extract was concentrated and reconstituted in hexane, followed by acetonitrile-hexane partition to remove lipids. The acetonitrile layer was purified with a double-layered cartridge column (graphite carbon black/primary secondary amine silica gel). After removal of the solvent, the extract was resolved in methanol/water and analyzed with LC-MS/MS. Recovery tests of 99 pesticide residues from Chinese dumpling were performed at 20 and 100 ng/g, and 72 pesticides exhibited acceptable recoveries (70-120%) with low relative standard deviations (<20%) at both concentrations. The time for sample preparation with 12 samples to test solutions was approximately 6 hr. This method could be useful for determination of pesticide residues in the Chinese dumplings.
authors.affiliation: Osaka Prefectural Institute of Public Health, Higashinari-ku,Osaka 5370025, Japan.
authors.forename: You
authors.initials: Y
authors.lastname: Okamoto
authors.forename: Satoshi
authors.initials: S
authors.lastname: Takatori
authors.forename: Yoko
authors.initials: Y
authors.lastname: Kitagawa
authors.forename: Masahiro
authors.initials: M
authors.lastname: Okihashi
authors.forename: Naoki
authors.initials: N
authors.lastname: Fukui
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Murata
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Sumimoto
authors.forename: Yukio
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Obana