title: Determination of diclazuril, toltrazuril and its two metabolites in poultry tissues and eggs by gel permeation chromatography-liquid chromatography-tandem mass spectrometry.
abstract: A new procedure has been described for the extraction of diclazuril (DIZ), toltrazuril (TOZ) and its two main metabolites toltrazuril sulphoxide (TZSO) and toltrazuril sulphone (TZS) from poultry tissues and eggs, using gel permeation chromatography (GPC). The analytes and the deuterated internal standard were extracted from the samples with ethyl acetate. The analytes were measured by LC coupled to an electrospray ionization tandem mass spectrometer operating in the negative ion mode. Excellent linear dynamic range was observed from 1 to 500 μg/L with the correlation coefficients (R(2)) better than 0.99 for all analytes. The method LOQ of the four analytes in real samples was 1.2 μg/kg for DIZ and TOZ, and 1.8 μg/kg for TZSO and TZS. These values are far lower than the maximum residue limits (MRLs) established by several control authorities. The developed method was accurate with overall recoveries in four matrices.
authors.affiliation: College of Chemistry and Environmental Science, Hebei University, Key Laboratory of Analytical Science of Hebei Province, Baoding, 071002, China.
authors.forename: Lianfeng
authors.initials: L
authors.lastname: Ai
authors.forename: Hanwen
authors.initials: H
authors.lastname: Sun
authors.forename: Fengchi
authors.initials: F
authors.lastname: Wang
authors.forename: Ruichun
authors.initials: R
authors.lastname: Chen
authors.forename: Chunhai
authors.initials: C
authors.lastname: Guo
mesh_terms: D000818:Animals; D002850:Chromatography, Gel / Q000379:methods*; D003049:Coccidiostats / Q000032:analysis; D004350:Drug Residues / Q000032:analysis*; D004531:Eggs; D016014:Linear Models; D009570:Nitriles / Q000032:analysis*; D011200:Poultry; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization; D053719:Tandem Mass Spectrometry / Q000379:methods*; D014227:Triazines / Q000032:analysis*
chemical_list: D003049:Coccidiostats; D009570:Nitriles; D014227:Triazines; C057884:diclazuril; C036670:toltrazuril