Abstract
Abstract An electrospray tandem mass spectrometry (ESI‐MS‐MS) method was developed for the analysis of selected phosphodiesterase type 5 (PDE‐5) inhibitors, namely, sildenafil, tadalafil, and vardenafil in pharmaceutical preparations and adulterated herbal products. The method permits a fast ( 100, 390>268, 489>169, respectively. The concentration of each compound was determined from the calibration curve constructed by the internal standard calibration using phenylalanine (m/z 166>103) as ...
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