title: [Determination of triadimenol residue in foods with dispersive solid phase extraction cleanup by gas chromatography-negative chemical ionization mass spectrometry].
abstract: A confirmatory method is presented for the determination of triadimenol residue in foods by dispersive solid phase extraction-gas chromatography-negative chemical ionization mass spectrometry (SPE-GC-NCI/MS). Triadimenol residue was extracted from different food samples, such as snow pea, carrot, orange, bean, spinach, oolong tea, rice, beef, longsnout catfish, royel jelly, red swamp crayfish, bee honey etc with acetonitrile containing 1% acetic acid and simultaneous liquid-liquid partitioning formed by adding anhydrous magnesium sulfate plus sodium acetate, followed by a simple clean-up step known by dispersive solid-phase extraction. The aliquot was determined and confirmed by gas chromatography-negative chemical ionization mass spectrometry using external standard method. The average recoveries at the three spiked levels (0.005, 0.010 and 0.020 mg/kg) in different samples ranged from 70% to 110%, and the relative standard deviations were lower than 12.0%. The linearity of detection ranged from 0.050 to 0.750 mg/L. The detection limit of the method was 0.001 mg/kg and the limit of quantification was 0.003 mg/kg. The method is selective with no interference and suitable for confirmatory of triadimenol residue in 12 categories of foods.
authors.affiliation: Food Laboratory of Jiangsu Entry-Exit Inspection and Quarantine Bureau, Nanjing 210001, China. swj9722418@yahoo.com.cn
authors.forename: Weijian
authors.initials: W
authors.lastname: Shen
authors.forename: Hong
authors.initials: H
authors.lastname: Lin
authors.forename: Zengyun
authors.initials: Z
authors.lastname: Zhao
authors.forename: Tao
authors.initials: T
authors.lastname: Ding
authors.forename: Jinzhong
authors.initials: J
authors.lastname: Xu
authors.forename: Chongyu
authors.initials: C
authors.lastname: Shen
mesh_terms: D005504:Food Analysis; D005506:Food Contamination / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D057230:Limit of Detection; D016014:Linear Models; D010573:Pesticide Residues / Q000032:analysis* / Q000302:isolation & purification*; D052616:Solid Phase Extraction / Q000379:methods*; D014230:Triazoles / Q000032:analysis* / Q000302:isolation & purification*
chemical_list: D010573:Pesticide Residues; D014230:Triazoles; C032910:triadimefon