title: Rapid simultaneous determination of dexamethasone and betamethasone in milk by liquid chromatography tandem mass spectrometry with isotope dilution.
abstract: A simple, sensitive and reliable analytical method for the rapid simultaneous determination of dexamethasone and betamethasone in milk by high performance liquid chromatography-negative electrospray ionization tandem mass spectrometry (HPLC-NESI-MS/MS) with isotope dilution was developed. Samples were directly purified through C(18) cartridge. Then the eluate was dried under nitrogen and residues were dissolved in mobile phase. Samples were analyzed by HPLC-MS/MS on a Hypercarb graphite column with a mixture of acetonitrile-water-formic acid as mobile phase. The samples were quantified using dexamethasone-D(4) as an internal standard. The procedure was validated according to the European Union regulation 2002/657/EC determining specificity, decision limit (CCalpha), detection capability (CCbeta), trueness, precision, linearity and stability. The method is demonstrated to be suitable for the determination of dexamethasone and betamethasone in milk. The total time required for the analysis of one sample was about 35 min.
authors.affiliation: College of Agriculture, Hebei University of Engineering, Handan 056038, China.
authors.forename: Cun
authors.initials: C
authors.lastname: Li
authors.forename: Yinliang
authors.initials: Y
authors.lastname: Wu
authors.forename: Ting
authors.initials: T
authors.lastname: Yang
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000818:Animals; D001623:Betamethasone / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003907:Dexamethasone / Q000032:analysis*; D004355:Drug Stability; D016014:Linear Models; D008892:Milk / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D003907:Dexamethasone; D001623:Betamethasone