Quantitative determination of 9-deoxo-16, 16-dimethyl-9-methylene-PGE2 in human plasma by GC-MS, RIA and HPLC

Comparisons were made of 9-deoxo-16,16-dimethyl-9-methylene-PGE2 levels in plasma determined by three assay methods. Plasma samples from Rhesus monkeys treated with 200 micrograms/kg 9-deoxo-16,16-dimethyl-9-methylene-PGE2 intravenously were analyzed by radioimmunoassay (RIA) and by high pressure liquid chromatography (HPLC). In a second experiment known amounts of 11 beta-3H-9-deoxo-16,16-dimethyl-9-methylene-PGE2 were added to human plasma at several concentration levels. The samples were analyzed by RIA, HPLC and gas chromatography-mass spectrometry (GC-MS). A limited number of comparisons have been made between RIA and GC-MS analysis of plasma samples from human subjects treated wtih 9-deoxo-16,16-dimethyl-9-methylene-PGE2. The results indicated that the three assay methods generally give comparable estimations of 9-deoxo-16,16-dimethyl-9-methylene-PGE2 content in plasma.