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NMR analysis of synthetic corticosteroids of the 1,4-dien-3-one type.

A procedure for the analysis of synthetic corticosteroids of the 1,4-dien-3-one type is described. The method is based upon NMR spectroscopy. Spectra are determined in dimethyl sulfoxide containing an internal reference substance, fumaric acid. Both bulk drugs and formulations can be assayed using this method, and comparison is made with results obtained from official assays on the steroids and their formulations. The average deviation obtained in the NMR method was 0.6%. A procedure for water-soluble 1,4-dien-3-ones is also described. This method uses triethylamine hydrochloride as an internal standard.