title: Screening of steroids in horse urine and plasma by using electron impact and chemical ionization gas chromatography-mass spectrometry.
abstract: Gas chromatography with chemical ionization mass spectrometry and selected-ion monitoring provided a sensitive method for the screening and confirmation of steroids in horse urine and plasma. Chemical ionization mass spectrometry was more sensitive than the electron impact ionization mass spectrometry for most of the steroids except for testosterone, prednisone-metabolite-2 and prednisolone-metabolite-2. The chromatographic conditions used in this study provided clean separation of different natural and synthetic steroids. Approximately 75-85% of the steroids added to plasma and approximately 65-70% of the steroids added to urine were recovered by the extraction procedure used in this study.
authors: Department of Veterinary Diagnostic Laboratory, College of Veterinary Medicine, University of Minnesota, St. Paul 55108.
authors: A K
authors: AK
authors: Singh
authors: B
authors: B
authors: Gordon
authors: D
authors: D
authors: Hewetson
authors: K
authors: K
authors: Granley
authors: M
authors: M
authors: Ashraf
authors: U
authors: U
authors: Mishra
authors: D
authors: D
authors: Dombrovskis
mesh_terms: D000818:Animals; D002855:Chromatography, Thin Layer; D008401:Gas Chromatography-Mass Spectrometry; D006736:Horses; D011239:Prednisolone / Q000097:blood / Q000652:urine; D011241:Prednisone / Q000097:blood / Q000652:urine; D013256:Steroids / Q000097:blood / Q000378:metabolism* / Q000652:urine; D013739:Testosterone / Q000097:blood / Q000652:urine
chemical_list: D013256:Steroids; D013739:Testosterone; D011239:Prednisolone; D011241:Prednisone