Simultaneous determination of triamcinolone acetonide and hydrocortisone in human plasma by high-performance liquid chromatography.

A validated HPLC method for the simultaneous determination of triamcinolone acetonide and hydrocortisone has been established to monitor the plasma levels of the compounds in healthy volunteers following intramuscular (i.m.) administration of triamcinolone acetonide. Plasma (1.0 ml) was extracted with dichloromethane after addition of the internal standard, fluocortolone. The compounds were separated using a LiChrospher RP 18 column and detected by UV absorbance. Specificity, linearity, as well as the repeatability, intermediate precision and accuracy of the method were established. The limit of quantification was 0.6 ng/ml for triamcinolone acetonide (C.V. = 8.7%, R.E. = 2.6%, n = 6) and 2.0 ng/ml for hydrocortisone (C.V. = 8.3%, R.E. = 2.8%, n = 6). Data on the stability of triamcinolone acetonide in human plasma are presented. Recovery of the compounds and the internal standard have been studied. The results of quality control samples (n = 126) determined during routine analysis of volunteer samples are described. Plasma levels of triamcinolone acetonide after i.m. administration of 40 mg of triamcinolone acetonide are presented.