Simultaneous high-performance liquid chromatographic determination of lornoxicam and its 5′-hydroxy metabolite in human plasma using electrochemical detection
1993
Abstract A selective and sensitive high-performance liquid chromatographic method with coulometric detection is described for the simultaneous quantitation of lornoxicam, a new oxicam class drug, and its 5′-hydroxy metabolite in human plasma. The two analytes and the internal standard are extracted from plasma at pH 4.0 by liquid—liquid extraction and separated on a C 18 column. Absolute detection limits using 100 μl of plasma are found to be 5 and 10 ng/ml for lornoxicam and 5′-hydroxylornoxicam, respectively. The assay described has been successfully applied to samples from clinical studies.
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