Identification of sildenafil, tadalafil and vardenafil by gas chromatography-mass spectrometry on short capillary column.
Sildenafil and its analogues (tadalafil and vardenafil) are phosphodiesterase type 5 inhibitors used in the treatment of male erectile dysfunction. Some dietary supplements, herbal preparations and food products which claim to enhance male sexual function have been found to be adulterated with these drugs. In this study, a gas chromatograph-mass spectrometer (GC-MS) assay was developed for identification of the drugs. In addition to good and short chromatographic separation that can be achieved within 6 min by using a short 10 m capillary column, no prior sample clean-up before GC-MS analysis was required, thus making this assay a cost saving and rapid method. Furthermore, the assay is specific as the identification of sildenafil, tadalafil and vardenafil were done by detection of molecular ions; m/z 474, 389 and 488, [corrected] respectively, and several other characteristic ions resulted from the mass fragmentation of individual molecules. Using our currently developed assay, sildenafil and its analogues were successfully identified in food and herbal matrices.
Toxicology Laboratory, National Poison Centre, Universiti Sains Malaysia, 11800 Penang, Malaysia. kaknin337@yahoo.com
Che Nin
CN
Man
Noorjuliana Md
NM
Nor
Razak
R
Lajis
Gam Lay
GL
Harn
D002243:Carbolines / Q000032:analysis* / Q000737:chemistry; D005504:Food Analysis; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D007093:Imidazoles / Q000032:analysis* / Q000737:chemistry; D010879:Piperazines / Q000032:analysis* / Q000737:chemistry; D028321:Plant Preparations; D011687:Purines / Q000032:analysis / Q000737:chemistry; D000068677:Sildenafil Citrate; D013450:Sulfones / Q000032:analysis* / Q000737:chemistry; D000068581:Tadalafil; D014227:Triazines / Q000032:analysis / Q000737:chemistry; D000069058:Vardenafil Dihydrochloride
D002243:Carbolines; D007093:Imidazoles; D010879:Piperazines; D028321:Plant Preparations; D011687:Purines; D013450:Sulfones; D014227:Triazines; D000069058:Vardenafil Dihydrochloride; D000068581:Tadalafil; D000068677:Sildenafil Citrate