Abstract
A high-performance liquid chromatographic method with ultraviolet detection has been developed to quantify NB-506 and its active metabolite in human plasma and urine. This method is based on solid-phase extraction, thereby allowing the simultaneous measurement of the drug and metabolite with the limit of quantification of 0.01 μg/ml in plasma and 0.1 μg/ml in urine. Standard curves for the compounds were linear in the concentration ranges investigated. The range for the drug in plasma was 0.01–2.5 μg/ml, and for the metabolite 0.01–1 μg/ml. In urine, the range for both compounds was 0.1–10 μg/ml. The method was validated and applied to the assay of plasma and urinary samples from phase I studies.
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