Stability-indicating assay for azathioprine and 6-mercaptopurine by reversed-phase high-performance liquid chromatography

Anthony F Fell, Plag Plag, J M Neil

Research output: Contribution to journalArticle

Abstract

A rapid method based on reversed-phase high-performance liquid chromatography is described for the separation and quantitation of azathioprine, 6-mercaptopurine and their potential contaminants and degradants present in dosage forms. Procedures based on simple dissolution or extraction in 0.02 M NaOH give quantitative precision of 1% relative standard deviation at the macro-level and 2% relative standard deviation for the micro-assay of analytes. The method is stability-indicating and has been used for preliminary studies of the degradation of azathioprine in 0.9% sodium chloride injection, subjected to thermal or ultraviolet irradiation treatment. The content uniformity of dosage forms of azathioprine and 6-mercaptopurine has been measured. Only azathioprine injection as the freeze-dried sodium salt was found to contain detectable amounts of contaminants 6-mercaptopurine, 1-methyl-4-nitro-5-chloroimidazole and hypoxanthine.

Original languageEnglish
Pages (from-to)691-704
Number of pages14
JournalJournal of Chromatography B: Biomedical Sciences and Applications
VolumeVol. 186
Publication statusPublished - 1979

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