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U.S. Department of Health and Human Services

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J Pharm Biomed Anal 2012 Nov;70:40-6

Screening for multiple phosphodiesterase type 5 inhibitor drugs in dietary supplement materials by flow injection mass spectrometry and their quantification by liquid chromatography tandem mass spectrometry.

Song F, El-Demerdash A, Lee SJ


A flow injection tandem mass spectrometry method (FI-MS/MS) has been developed to detect enzyme phosphodiesterase type 5 inhibitors, including tadalafil, sildenafil, and vardenafil. Multiple reaction monitoring (MRM) was used to detect the drugs and product ion ratios were used for identification. FI-MS/MS was used for semi-quantification and liquid chromatography tandem mass spectrometry (LC-MS/MS) was used for further confirmation and quantification. One of 13 samples has been found to be adulterated with prescription levels of tadalafil and also low level of sildenafil. The method can be used for screening large numbers of herbal products for adulteration since it takes less than 1min without chromatographic separation on a column.

Category: Journal Article
PubMed ID: #22695818 DOI: 10.1016/j.jpba.2012.05.017
Includes FDA Authors from Scientific Area(s): Regulatory Affairs
Entry Created: 2012-06-18 Entry Last Modified: 2012-11-30