Stability-indicating assay for oxyphenbutazone. Part II. High-performance liquid chromatographic determination of oxyphenbutazone and its degradation products

Abstract

A high-performance liquid chromatographic method is proposed for the simultaneous determination of oxyphenbutazone and six potential decomposition products, using a reversed-phase column and ultraviolet detection. The method is more sensitive than thin-layer chromatography and allows the determination of 0.1% of each degradation product (with respect to oxyphenbutazone). It has been applied to the analysis of commercial tablets, capsules and ointments.