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  • Title: Rapid high-performance liquid chromatographic method for the determination of ketamine and its metabolite dehydronorketamine in equine serum.
    Author: Seay SS, Aucoin DP, Tyczkowska KL.
    Journal: J Chromatogr; 1993 Oct 29; 620(2):281-7. PubMed ID: 8300800.
    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.
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