Abstract
Abstract A high-performance liquid chromatographic method is described for the simultaneous measurement of carbamazepine, phenobarbital and their major metabolites in small samples of serum, brain tissue and urine. This involves solvent extraction, reversed-phase chromatography and ultraviolet detection at 195 nm. Glucuronides in urine are hydrolyzed by enzymatic cleavage with β-glucuranidase. Quantitation is based on the peak-height ratio of the analyte to its internal standard (10, 11-dihydrocarbamaze-pine or p-methylphenobarbital). The results obtained show that the method is precise and reproducible.
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