Spectrophotometric Methods for Simultaneous Estimation Of Pyrimethamine And Sulphadoxine In Bulk Drug And Pharmaceutical Formulations
About Authors:
Kalpesh N. Patel1*, Jayvadan K. Patel2
1 Research Scholar, Jodhpur National University, Jodhpur,
Rajshathan, India
2 Department of Pharmaceutical Technology,
Nootan Pharmacy College,
Visnagar (GUJARAT), India.
Abstract
Two simple spectrophotometric methods have been developed for simultaneous estimation of pyrimethamine and sulphadoxine from tablet dosage form. Method-I simultaneous equation method involves the measurement of absorbances at two wavelengths 215 nm (λmax of pyrimethamine) and 254 nm (λmax of sulphadoxine) in methanol and Method-II first order derivative spectroscopic method involves the measurement of absorbances at two wavelengths 250 nm (λmax of pyrimethamine) and 220.5 nm (λmax of sulphadoxine); The linearity lies between 5-30 µg/ml for both pyrimethamine and sulphadoxine for all the two methods. The accuracy and precision of the methods were determined and validated stastically. All the methods showed good reproducibility and recovery with % RSD less than 2. All method were found to be rapid, specific, precise and accurate and can be successfully applied for the routine analysis of pyrimethamine and sulphadoxine in bulk and combined dosage form.
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