Spectrophotometric Determination of Etravirine in Bulk and Pharmaceutical Formulations

Abstract

Two simple, rapid, sensitive, accurate, precise and economical Visible Spectrophotometric methods have been developed for the determination of Etravirine in pure and pharmaceutical formulations. These methods (A and B) were based on nucleophilic substitution and oxidative coupling reactions of Etravirine by 1,2 - naphtha quinone-4-sulphonate (NQS) in alkaline medium and 3-methyl-2-benzothiazolinone hydrazone (MBTH) in acidic medium with the maximum absorbance at 414 nm and 635 nm respectively. Linearity was obtained in the concentration range of 5 - 30 μg/ml and 2 - 10 μg/ml which was corroborated by the correlation coefficient (r) values of 0.9995 and 0.9996 respectively. The methods developed were validated with respect to linearity, accuracy (recovery), precision, Sandell’s sensitivity, molar extinction coefficient and specificity. The proposed methods are successfully applied for the determination of Etravirine in bulk and pharmaceutical formulations and results were validated statistically by recovery studies.