Abstract
A rapid liquid chromatography–electrospray ionization–tandem mass spectrometry (LC-ESI-MS/MS) method was developed for the determination of montelukast in human plasma. The extraction of montelukast from plasma (300 µL) involved protein precipitation. Quantitation was performed using LC-ESI-MS/MS, operating in the positive ion and selective reaction monitoring (SRM) mode. The total chromatographic run time for the analysis was 1.5 min. A linear dynamic range was established from 5 to 800 ng mL−1 for montelukast. The method was fully validated especially with regard to real subject sample analysis. It was successfully applied to a bioequivalence study in 18 healthy human subjects under fed condition (human subjects were allowed to eat as per the prescribed diet for bioequivalence study).
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