Journal
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
Volume 738, Issue 2, Pages 419-425Publisher
ELSEVIER
DOI: 10.1016/S0378-4347(99)00531-9
Keywords
10-hydroxycarbazepine; carbamazepine-10,11-trans-dihydrodiol
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An enantioselective HPLC method for the simultaneous determination of the concentration of the enantiomers of the oxcarbazepine metabolites 10-hydroxycarbazepine (MHD) and carbamazepine-10,11-trans-dihydrodiol (DHD) in human urine is described. The method is based on extraction with tert.-butylmethyl ether-dichloromethane (2:1, v/v) under alkaline conditions, separation and evaporation of the organic phase and dissolution of the residue in the mobile phase. Enantiomers are resolved on a Diacel Chiralcel OD column (250 mmx4.6 mm I.D.) under isocratic conditions using as mobile phase n-hexane-ethanol-2-propanol (18:2:1, v/v/v) with addition of glacial acetic acid (0.1%), The enantiomers are detected by UV at 215 nm. The method allows reliable determination of the MHD and DHD enantiomers in human urine with limits of quantification of 0.2 mg/l and 0.4 mg/l, respectively. (C) 2000 Elsevier Science B.V. All rights reserved.
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