title: Stability indicating RP-LC determination of sildenafil citrate (Viagra) in pure form and in pharmaceutical samples.
abstract: A simple, precise, sensitive and stability-indicating reverse-phase high performance liquid chromatographic (RP-HPLC) method has been developed for the quantitation of sildenafil citrate (SC) in pure form and its pharmaceutical formulations. Method employs water and acetonitrile (48:52 v/v) as mobile phase with flow rate of 1 ml min(-1), LiChrospher C18-5 microm (25 x 0.46 cm) column and UV detection set at 245 nm. The internal standard method using piroxicam (PX) as the internal standard is used. The linear dynamic range of SC was found to be 0.05-7.5 microg ml(-1). The proposed method is successfully employed for the determination of SC in the tablets. The excipients present in the formulations do not interfere with the assay procedure. Analytical parameters were calculated and full statistical evaluation is included.
authors.affiliation: Department of Studies in Chemistry, University of Mysore, Manasagangotri, 570 006, Mysore, India.
authors.forename: N D
authors.initials: ND
authors.lastname: Dinesh
authors.forename: B K
authors.initials: BK
authors.lastname: Vishukumar
authors.forename: P
authors.initials: P
authors.lastname: Nagaraja
authors.forename: N M
authors.initials: NM
authors.lastname: Made Gowda
authors.forename: K S
authors.initials: KS
authors.lastname: Rangappa
mesh_terms: D000097:Acetonitriles / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D004355:Drug Stability; D005079:Excipients / Q000737:chemistry; D010879:Piperazines / Q000032:analysis*; D011687:Purines; D015203:Reproducibility of Results; D000068677:Sildenafil Citrate; D013450:Sulfones; D014867:Water / Q000737:chemistry
chemical_list: D000097:Acetonitriles; D005079:Excipients; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D014867:Water; D000068677:Sildenafil Citrate; C032159:acetonitrile