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  • Title: Electron-capture GLC determination of clobazam and desmethylclobazam in plasma.
    Author: Greenblatt DJ.
    Journal: J Pharm Sci; 1980 Nov; 69(11):1351-2. PubMed ID: 6109011.
    Abstract:
    Electron-capture GLC was utilized for simultaneous quantitation of clobazam, a 1,5-benzodiazepine derivative, and its active metabolite, desmethylclobazam, in human plasma and serum. After addition of diazepam as the internal standard, samples were extracted into benzene--isopentanol. The organic extracts were evaporated to dryness, reconstituted, and subjected to chromatographic analysis without derivatization or cleanup. All three compounds were resolved completely and had favorable chromatographic properties using an OV-101 liquid phase. The limits of detection are 3--5 ng/ml for clobazam and 5--10 ng/ml for desmethylclobazam. Relative standard deviations for identical samples do not exceed 6%. The application of the method to a clinical pharmacokinetic study is demonstrated.
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