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A high-performance liquid chromatographic method has been developed for the determination of metapramine in human plasma and urine. After selective extraction and derivatization with dansyl chloride, metapramine and the internal standard (maprotiline) are chromatographed on a reversed-phase LiChrosorb RP-18 column using a mixture of water--acetonitrile (35:65) as mobile phase. The eluted compounds are measured using a fluorescence detector. The detection limit of the assay for plasma and urine samples is about 1 ng/ml. The method has been successfully applied in a pharmacokinetic study following intravenous administration of 35 mg of metapramine.
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