B. Vijaya Kumar

The aim of the present work was to develop and optimize gastroretentive floating system of Gemifloxacin mesylate using HPMC polymers, Gelucire 50/13 and Polyox WSR 301 to improve oral bioavailability of Gemifloxacin mesylate floating tablets by increasing gastric residence time. The tablets were prepared by direct compression method. The effect of polymers concentration and viscosity grades of HPMC on drug release profile was evaluated. The result of in vitro dissolution study showed that the drug release profile could be sustained by increasing the concentration of HPMC and Polyox WSR 301. The optimized formulation (F12) containing HPMC K100M, Gelucire 50/13 and Polyox WSR301 showed 99.12% drug release at the end of 12h. The optimized formulations (F12) containing showed desired buoyancy (floating lag time of about 35 seconds and total floating time of >12h). Optimized formulation (F12) followed diffusion controlled zero order kinetics and non-fickian transport of the drug. FTIR studies revealed the absence of any chemical interaction between drug and polymers used.

This study describes the development and validation for the determination of Prasugrel Hydrochloride in bulk and pharmaceutical dosage form by the first-order derivative UV spectroscopy method. The quantification was achieved by the first-order derivative spectroscopy method at 248 nm over the concentration range of 5-25 μg/ml for estimation of Prasugrel Hcl (r2=0.9993) keeping methanol as solvent in zero order derivatization and same 5-25 μg/ml for estimation of Prasugrel Hcl (r2=0.9981) in methanol upon first order derivatization. Procedure does not require prior separation of components from the sample. LOD values for Prasugrel Hclwas found to be 0.591μg/mL for zero order derivatization and upon first order derivatization 0.165 μg/mL. LOQ values for Prasugrel Hclwas found to be 1.970 μg/mL for zero order derivatization and upon first order derivatization0.55 μg/mL. The results of analysis have been validated statistically and recovery studies carried out in the range 50-150% to confirm the accuracy of the proposed method. The relative standard deviation was found to be