Abstract

Giri Prasad Gorumutchu¹, Venkata Nadh Ratnakaram*²and Sireesha Malladi³

DOI : http://dx.doi.org/10.13005/ojc/35Specialissue107

A simple spectrophotometric method was developed to determine riociguat in bulk and tablet formulation. The present method lies on the oxidation of MBTH by Fe⁺³ ions in acidic medium to form active coupling species and followed by its coupling with riociguat to form the chromophore having lmax 660 nm. Validated the proposed method as per the existing guidelines of ICH. Good linearity (r~ 0.999) was observed for calibration curve in the studied concentration range (6.25 – 37.50 μg mL^-1). Reproducibility, accuracy and precision of the method were confirmed from low values of % RSD.

MBTH; Oxidative Coupling; Riociguat; Validation; Visible Spectrophotometry

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