Kaushik P

The present manuscript describes simple, sensitive, rapid, accurate, precise and economical Q-absorbance ratio method for the simultaneous determination of diclofenac sodium and tolperisone hydrochloride in bulk and synthetic mixture. Absorbance ratio method uses the ratio of absorbances at two selected wavelengths, one which is an isoabsorptive point and other being the λ-max of one of the two components. Tolperisone hydrochloride and diclofenac sodium show an isoabsorptive point at 267 nm in methanol. The second wavelength used is 255 nm, which is the λ-max of tolperisone hydrochloride in methanol. The linearity was obtained in the concentration range of 2-20 μg/ml for both tolperisone hydrochloride and diclofenac sodium. The concentrations of the drugs were determined by using ratio of absorbances at isoabsorptive point and at the λ-max of tolperisone hydrochloride. The method was successfully applied to pharmaceutical dosage form because no interference from the synthetic mixture excipients was found. The suitability of this method for the quantitative determination of tolperisone hydrochloride and diclofenac sodium was proved by validation. The proposed method was found to be simple and sensitive for the routine quality control application of tolperisone hydrochloride and diclofenac sodium in synthetic mixture or pharmaceutical dosage form. The results of analysis have been validated statistically and by recovery studies.

The objective of this research work was to prepare sustained release matrix tablets of doxofylline. Doxofylline is a  xanthine bronchodilator having reduced affinity for A1 & A2 adenosine receptors. Different grades of hydrophilic polymers( HPMC K4M, HPMC K15 cps, HPMC K100 M, Sodium carboxymethylcellulose) and hydrophobic polymer (ethyl cellulose) were used. FTIR study shows that drug and other excipients are compatible with each other. Tablets were prepared by wet granulation technique using non-aqueous solvent IPA and PVP K90D as a binder. Under stage I of preliminary study, tablets were formulated using polymers alone. In stage II polymers were used in combination, with an objective of sustaining release up to 12 hrs. The effect polymer concentration on drug release profile was  investigated. The amounts of HPMC K100 M & NaCMC were selected as independent variables. The results of  final batches indicated that a low concentration of HPMC K100 M & high amount of Sodium CMC favours sustained release of doxofylline from matrix tablets. Accelerated stability study for 8 weeks  confirmed that the best selected formulation F 15 was stable