title: Simplified pesticide multiresidue analysis of soybean oil by low-temperature cleanup and dispersive solid-phase extraction coupled with gas chromatography/mass spectrometry.
abstract: A simple, fast, and economical method has been developed for the simultaneous determination of 28 various types of pesticides in soybean oil. Pesticides of low molecular mass were separated from the fat of the oil, which has a high molecular mass, by using low-temperature fat precipitation, followed by a cleanup process based on dispersive solid-phase extraction with primary secondary amine and C18 as sorbents and magnesium sulfate for the removal of residual water. The results for all pesticides determined by gas chromatography with mass spectrometry in the selected-ion monitoring mode were linear, and the matrix effect of the method was evaluated. Recoveries of most pesticides were acceptable at fortification levels of 0.02, 0.05, 0.2, and 1 mg/kg. The relative standard deviation was <20% even for determinations without internal standards. Limits of quantitation ranged from 20 to 250 microg/kg.
authors.affiliation: China Agricultural University, College of Science, Beijing, 100094, People's Republic of China.
authors.forename: Li
authors.initials: L
authors.lastname: Li
authors.forename: Yanjun
authors.initials: Y
authors.lastname: Xu
authors.forename: Canping
authors.initials: C
authors.lastname: Pan
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Zhou
authors.forename: Shuren
authors.initials: S
authors.lastname: Jianc
authors.forename: Fengmao
authors.initials: F
authors.lastname: Liu
mesh_terms: D000588:Amines / Q000737:chemistry; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D005504:Food Analysis / Q000379:methods; D005506:Food Contamination; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D007477:Ions; D000442:Octanols / Q000737:chemistry; D010573:Pesticide Residues / Q000032:analysis* / Q000737:chemistry; D010575:Pesticides / Q000032:analysis* / Q000737:chemistry; D015203:Reproducibility of Results; D052616:Solid Phase Extraction; D013024:Soybean Oil / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors
chemical_list: D000588:Amines; D007477:Ions; D000442:Octanols; D010573:Pesticide Residues; D010575:Pesticides; D013024:Soybean Oil