title: Rapid high-performance liquid chromatographic method for the determination of ketamine and its metabolite dehydronorketamine in equine serum.
abstract: A simple, rapid and sensitive high-performance liquid chromatographic procedure has been developed for the determination of ketamine and dehydronorketamine in equine serum. Sample preparation consisted of mixing equal volumes of serum and acetonitrile-phosphoric acid (85%)-water (20:2:78, v/v/v), followed by ultrafiltration through a 10,000 molecular mass cut-off filter. Separation of these two analytes in the ultrafiltrate was accomplished on a reversed-phase phenyl column eluted with methanol-acetonitrile-phosphate buffer solution. Ketamine and dehydronorketamine were detected by a variable photometric UV-Vis detector set at 215 nm, and confirmed by a photodiode array detector operated in the 200-320 nm range. The limit of detection for ketamine was 5-15 ng/ml in equine serum. Additionally, the dehydronorketamine peak identity was tentatively confirmed by thermospray liquid chromatography-mass spectrometry.
authors.affiliation: Sphinx Pharmaceuticals Corporation, Durham, NC 27717.
authors.forename: S S
authors.initials: SS
authors.lastname: Seay
authors.forename: D P
authors.initials: DP
authors.lastname: Aucoin
authors.forename: K L
authors.initials: KL
authors.lastname: Tyczkowska
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006736:Horses / Q000097:blood*; D007649:Ketamine / Q000031:analogs & derivatives* / Q000097:blood* / Q000378:metabolism; D013058:Mass Spectrometry; D013056:Spectrophotometry, Ultraviolet
chemical_list: C033420:5,6-dehydronorketamine; D007649:Ketamine