Gowri Sankar Dannana

The present study is carried out using the UPLC as the analytical technique in developing and validating an accurate, precise, linear and robust analytical method for the simultaneous estimation of Pitofenone hydrochloride, Diclofenac potassium and Fenpiverinium bromide in tablets. The method is optimized with a mixture of 0.01M phosphate buffer (PH4.8) and Acetonitrile in the ratio of 40:60 (V/V) as mobile phase and Agilent SB C18 (250 X 4.6) mm, 5µm as stationary phase. The Chromatographic peaks were detected and measured at 215nm. The retention times of Pitofenone hydrochloride, Diclofenac potassium and Fenpiverinium bromide were found to be 1.0, 1.66 and 2.0 respectively. The developed method was demonstrated to access its suitability for meeting its intended purpose by the Validation with a set of validation parameters as per ICH and USP guidelines.  The method is found to be precise with %RSD - 0.48, 0.69, 0.66 for Pitofenone hydrochloride, Diclofenac potassium and Fenpiverinium bromide respectively: accurate with the recoveries of 99.6 to 101.6, 100.51 to 101 and about 100% for Pitofenone hydrochloride, Diclofenac potassium and Fenpiverinium bromide respectively. The method is proved to be linear from the conc.12.5 to 75ppm for Pitofenone, 250 to750 ppm for Diclofenac and 0.5 to 1.5ppm for Fenpiverinium bromide with the correlation coefficients of 0.999, 0.999 and 0.999 respectively. Hence the developed method could be used for the routine analysis purpose in the evaluation of Pitofenone, Diclofenac potassium and Fenpiverinium bromide Tablets.

A selective, sensitive and rapid UPLC-MS/MS method has been developed and validated for simultaneous quantification of pramipexole, ropinirole and rasagiline in human plasma using trimetazidine as internal standard (IS). The analytes and IS were extracted from 200 µL of plasma by solid phase extraction technique using strata cartridges which offers high sensitivity, wide linearity without interferences form endogenous matrix components. Chromatographic separation was achieved in 3.00 min run time on a Synergi Polar RP column using a 5 mM ammonium acetate/methanol mobile phase in gradient mode. The quantification of target compounds was performed in a positive electrospray ionization mode and multiple reaction monitoring (MRM). The proposed method was validated over the concentration ranges of 5-50000 pg/mL for each analyte. The intra- and inter-day precision and accuracy results were acceptable as per FDA guidelines. Stability of compounds were established in a battery of stability studies, i.e. bench top, auto sampler, dry extract and long term storage stability as well as freeze-thaw cycles. The validated method has been successfully used to analyze human plasma samples for application in pharmacokinetic studies.