Validated UV Spectrophotometric Methods for the Estimation of Letrozole in Solid Dosage Forms

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The main intent of this research is to develop two new simple, novel, cost efficient and precise UV spectrophotometric methods for estimation of letrozole in pure and pharmaceutical dosage forms. For estimation of letrozole based on the measurement of UV light absorption, the spectras of letrozole were scanned efficiently and it exhibits maximum absorption wavelength (λmax) at 240nm for Method A and 245nm for Method B. The analysis was carried out against phosphate buffer pH 6.8 (Method A) and phosphate buffer pH 3.8 (Method B) respectively. The drug shows linear response commencing from 0.5-20 µg/mL for both methods A & B. The regression equation was found as Y= 0.099X + 0.079 (Method A) and Y= 0.1359x + 0.0048 (Method B), and correlation coefficient were 0.999 (Method A) and 0.9999 (Method B). The method validation was accomplished as per the regulation of ICH Q2R1 guidelines for linearity, accuracy, and precision studies. These reported methods have good reproducibility with percentage RSD less than one. These methods were extended towards the formulation and there was no interruption from excipients in the formulation. Hence, these proposed methods can be effectively employed for evaluation of letrozole in quality control as well as routine analysis work in pharmaceutical industries.

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