High performance thin layer chromatographic method for simultaneous estimation of paracetamol and valdecoxib in tablet dosage form
Dept. of Pharmaceutical Analysis, College of Pharmacy, Sri Ramakrishna Institute of Paramedical Sciences, Coimbatore-641 044, India
M Gandhimathi Dept. of Pharmaceutical Analysis, College of Pharmacy, Sri Ramakrishna Institute of Paramedical Sciences, Coimbatore-641 044 India E-mail: [email protected]
A new simple, sensitive and precise high performance thin layer chromatographic method has been developed for estimation of paracetamol and valdecoxib simultaneously from a combined dosage form. In this method pre coated silica gel 60 GF 254 TLC plate was used as stationary phase and the chromatogram was developed using chloroform: isopropyl alcohol: glacial acetic acid (9.5:1:0.2 v/v/v) as mobile phase. Paracetamol and valdecoxib showed Rf values 0.14±0.01 and 0.51±0.03, respectively. The plate was scanned and quantified at 250 nm using Camag TLC Scanner. The linear concentration was 2.5 to 12.5 µg/spot for paracetamol and 0.1 to 0.5 µg/spot for valdecoxib. The %RSD of intra day variation was 0.18±0.01 for paracetamol and 0.24±0.01 for valdecoxib. For inter day variation the %RSD was 0.03±0.005 and 0.1±0.02 for paracetamol and valdecoxib, respectively.