Simultaneous equation

The present manuscript describes sensitive, rapid, accurate, and precise spectrophotometric method for simultaneous estimation of allopurinol and aceclofenac in pharmaceutical dosage form. Simultaneous equation method used at 250nm & 273nm as λmax of allopurinol and aceclofenac respectively in 0.1N HCl. Both the drugs follow beer-lamber’s law on the concentration range 2-12µg/ml and 2-24µg/ml respectively for allopurinol & aceclofenac. The mean percentage recovery is 100.01% and 99.4% for allopurinol and aceclofenac respectively by simultaneous equation. The method has been validated as per ICH guidelines. The proposed method effectively applied to bulk drug and pharmaceutical formulation. The accuracy and reproducibility are close to 100% with acceptance range of %R.S.D. The method was successfully applied to pharmaceutical dosage form because no interference was found from excipient. 

A simple, precise, accurate, rapid and economical spectrophotometric method have been developed for simultaneous estimation of Pantoprazole sodium and Levosulpiride in pure and in combined capsule dosage form. Method-1 simultaneous equations and Method-2 Q-absorbance Ratio method by using 287 nm and 231 nm as absorbance maxima (λ max)for Pantoprazole  sodium and Levosulpiride  respectively and 248 nm (isoabsorptive point). A methanol was used as Solvent. Linearity was observed in the concentration range of 5-30 µg/ml for Pantoprazole sodium and 5-30 µg/ml for Levosulpiride. The method was validated statistically and recovery study was performed to confirm the accuracy of the method.