Abstract
A sensitive, selective and rapid reverse-phase high-performance liquid Chromatographic method was developed for the simultaneous analysis of imipramine, desipramine, amitriptyline and nortriptyline in human plasma. The procedure consisted of extracting the drugs and the internal standard (clomipramine) from 1 ml plasma with hexane:isoamyl alcohol (99:1, v/v) in alkaline medium. A newly marketed column, LiChrospher® 60 RP-select B (dp 5 μm) of Merck was employed. The mobile phase, consisting of acetonitrile/0.25 N sodium acetate buffer at pH 5.5 (50:50, v/v), was delivered at a flow rate of 1.0 ml/min, and detection at 254 nm. The precision, linearity and limit of quantification of the method were within acceptable limits. The method was considered adequate and has, therefore, been used in routine analysis for the therapeutic control of depressed patients.
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