title: Analysis of eight free progestogens in eggs by matrix solid-phase dispersion extraction and very high pressure liquid chromatography with tandem mass spectrometry.
abstract: A rapid method to identify and quantify unconjugated progestogens in eggs is presented. Samples were prepared based on matrix solid-phase dispersion (MSPD) using C18 as dispersant, followed by a clean-up step with graphitized carbon black (GCB) solid-phase extraction (SPE) cartridges. The analytes were separated by very high pressure LC on a BEH C18 column for a period of 5 min. Electrospray ionization tandem mass spectrometry (ESI-MS/MS) was operated in the positive time-scheduled multi-reaction monitoring mode. Recovery studies were performed at two fortification levels. Average recoveries of the target compounds varied from 83.8% to 111.2% and relative standard deviations ranged from 10.5% to 23.7%. The limits of detection (LODs) and limits of quantitation (LOQs) were in the range of 0.2-2.0 microg kg(-1) and 0.6-5.0 microg kg(-1), respectively. Investigation of real samples indicated that the range of progesterone in eggs was 9.9-40.0 microg kg(-1).
authors.affiliation: Central Lab, Beijing Center for Disease Control and Prevention, Beijing 100013, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Yang
authors.forename: Bing
authors.initials: B
authors.lastname: Shao
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.forename: Yongning
authors.initials: Y
authors.lastname: Wu
authors.forename: Jie
authors.initials: J
authors.lastname: Ying
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004531:Eggs / Q000032:analysis*; D011372:Progestins / Q000032:analysis*; D052616:Solid Phase Extraction / Q000379:methods*; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D011372:Progestins