title: [Analysis of acephate, methamidophos and omethoate in animal and fishery products, and honey by LC-MS].
abstract: We studied the simultaneous determination of acephate, methamidophos, and omethoate in animal and fishery products, their processed foods, and honey by means of liquid chromatography coupled with mass spectrometry (LC-MS). The sample was extracted with ethyl acetate in the presence of anhydrous Na(2)SO(4) (and diatomaceous earth for honey). An aliquot of the crude sample extract was loaded into the GPC system, and the pesticide fraction was selectively collected. The extract was cleaned up on a PSA mini-column, and determined by a column-switching ESI-SIM mode LC-MS. Mean recoveries (2 replicates x 5 days) of compounds from eleven kinds of samples, except honey, fortified at the analyte concentration of 0.05 microg/g were from 71.4% to 98.4%. The repeatability relative standard deviation values were < or =12.5%, and the intermediate reproducibility relative standard deviation values were < or =14.1%. In honey, the recoveries were improved to 97.6-98.6% by using highly purified surrogates.
authors.affiliation: Aichi Prefectural Institute of Public Health, Nagoya, Japan.
authors.forename: Eiji
authors.initials: E
authors.lastname: Ueno
authors.forename: Haruka
authors.initials: H
authors.lastname: Ohno
authors.forename: Takashi
authors.initials: T
authors.lastname: Tanahashi
authors.forename: Harumi
authors.initials: H
authors.lastname: Oshima
authors.forename: Eiichi
authors.initials: E
authors.lastname: Mikami
authors.forename: Satoru
authors.initials: S
authors.lastname: Nemoto
authors.forename: Rieko
authors.initials: R
authors.lastname: Matsuda
mesh_terms: D000818:Animals; D002853:Chromatography, Liquid; D004117:Dimethoate / Q000031:analogs & derivatives* / Q000032:analysis; D004531:Eggs / Q000032:analysis; D005396:Fish Products / Q000032:analysis*; D005511:Food Handling; D006722:Honey / Q000032:analysis*; D007306:Insecticides / Q000032:analysis*; D013058:Mass Spectrometry; D008460:Meat / Q000032:analysis*; D009946:Organothiophosphorus Compounds / Q000032:analysis*; D063088:Phosphoramides
chemical_list: D007306:Insecticides; D009946:Organothiophosphorus Compounds; D063088:Phosphoramides; C002302:dimethoxon; C001969:acephate; C014655:methamidophos; D004117:Dimethoate