UV Spectrophotometer.

Two simple, precise and economical UV methods have been developed for estimation of Methotrexate in bulk formulation. Method A involves measurement of UV absorbance in Zeroorder derivative at 303nm. Method B deals with area under curve measurement (AUC method), which involves the calculation of integrated value of absorbance with respect to wavelength between 300-306nm.  The drug follows Beer-Lambert’s law in the concentration range of 3-15μg/ml in both the methods. Results of analysis were validated statistically and were found to be satisfactory. Thus proposed methods can be successfully applied for estimation of Methotrexatein routine analytical work.

A simple, accurate, precise, reproducible and economical UV spectroscopic methods for simultaneous estimation of Flupentixol and Melitracen in tablet dosage form have been developed. simultaneous equation method employs formation and solving of mathematical simultaneous equation using 254 nm and 230 nm as the λmax of Melitracen and Flupentixol respectively in 0.1N HCl. These methods were validated as per ICH norms. Calibration curves were linear over the concentration ranges of 1-10 μg/ml for Flupentixol and 10-100 μg/ml for Melitracen with mean recovery of 100.71 ± 1.53 & 100.36 ± 0.66 for Flupentixol & Melitracen respectively by Simultaneous Equation method. The validation study is statistically significant as all the statistical parameters are within the acceptance range (% RSD < 2.0 and S.D. < 2.0) for both accuracy and precision. The methods are successfully applied to pharmaceutical formulation, with no interference from excipients as indicated by the recovery study. The proposed methods are simple, rapid, economic and accurate for routine simultaneous estimation of Flupentixol and Melitracen.