title: [Study of multi-residue method for determining pesticide residues in processed foods manufactured from agricultural products by LC-MS/MS].
abstract: A rapid multi-residue method for determination of pesticide residues in processed foods manufactured from agricultural products was examined. Five mL water was added to 5 g sample in a polypropylene tube, and the tube was left to stand at room temperature for 30 min. Then, 20 mL acetonitrile was added to the sample. The mixture was homogenized in a high-speed homogenizer, followed by salting out with 1 g NaCl and 4 g anhydrous MgSO4. After centrifugation, the organic layer was purified on a graphitized carbon/PSA cartridge column. After removal of the solvent, the extract was resolved in methanol-water and analyzed with LC-MS/MS. The recoveries of 93 pesticides fortified into 5 kinds of processed foods [Chinese cabbage kimchi, marmalade, raisin, umeboshi (pickled plum) and worcester sauce] were examined at the concentrations of 0.02 and 0.1 μg/g (n=5). The recoveries of 61 pesticides in all foods were 70-120% with relative standard deviation below 20% at both concentrations. Seventy-four processed foods obtained from markets in Japan were examined with this method. Pesticide residues over the maximum residue limit (0.01 μg/g) were detected in 2 processed foods.
authors.affiliation: Osaka Prefectural Institute of Public Health.
authors.forename: Naoki
authors.initials: N
authors.lastname: Fukui
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: Keiji
authors.initials: K
authors.lastname: Kajimura
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Obana
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D018556:Crops, Agricultural / Q000737:chemistry*; D005504:Food Analysis / Q000379:methods*; D005506:Food Contamination / Q000032:analysis*; D005511:Food Handling; D008452:Maximum Allowable Concentration; D010573:Pesticide Residues / Q000032:analysis*; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D010573:Pesticide Residues