Abstract
A reversed-phase LC method with electrochemical detection is described for the simultaneous determination of monatepil maleate (AJ-2615, AJ), a novel calcium entry blocker, and its three S-oxidized metabolites in plasma. These compounds were extracted from plasma by solid-phase extraction and injected onto an ODS column. The determination limit in plasma (0.5 ml) was 10 ng/ml for AJ and 5 ng/ml for the three metabolites. The method was applied to the determination of AJ and the metabolites in rat plasma samples.
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