title: Multiresidue analysis of 47 pesticides in cooked wheat flour and polished rice by liquid chromatography with tandem mass spectrometry.
abstract: Liquid chromatography in conjunction with tandem mass spectrometry was used to directly quantify of 47 pesticide residues from cooked wheat flour and polished rice, which are the most widely consumed cereals in the Republic of Korea. The sample clean-up was carried out according to the method established by the Korea Food and Drug Administration. The mobile phase for liquid chromatography separation consisted of water and 5 mm methanolic ammonium formate. Tandem mass spectroscopy experiments were performed in electrospray ionization positive mode and the multiple reaction monitoring mode. The matrix effects estimated for the 47 pesticides had a mean value of 99% and ranged from 45 to 147%. High recoveries (70-140%) and relative standard deviations (< or = 20%) were achieved for most of the pesticides tested. The method used in this study allowed for rapid quantification and identification of low levels of pesticides in cooked wheat flour and polished rice samples. Of the screened pesticide residues, only tricyclazole and fenobucarb were found in polished rice samples. However, no samples contained residues above the MRL established by the Korea Food and Drug Administration.
authors.affiliation: Department of Chemistry and Research Institute of Life Science, Gyeongsang National University, Jinju 660-701, Republic of Korea.
authors.forename: Sung Jung
authors.initials: SJ
authors.lastname: Lee
authors.forename: Hyeong Jin
authors.initials: HJ
authors.lastname: Park
authors.forename: Wooseong
authors.initials: W
authors.lastname: Kim
authors.forename: Jong Sung
authors.initials: JS
authors.lastname: Jin
authors.forename: A M
authors.initials: AM
authors.lastname: Abd El-Aty
authors.forename: Jae-Han
authors.initials: JH
authors.lastname: Shim
authors.forename: Sung Chul
authors.initials: SC
authors.lastname: Shin
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005433:Flour / Q000032:analysis*; D007723:Korea; D012275:Oryza / Q000737:chemistry*; D010573:Pesticide Residues / Q000032:analysis* / Q000737:chemistry; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D010573:Pesticide Residues