The sterols and tetracyclic triterpenoids of Digitalis purpurea L. seeds

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Abstract
Three types of sterols were isolated from the non-saponified fraction of D. purpurea seed oil. These were the 4,4′-dimethylsterols, the 4α-methylsterols and the 4-desmethylsterols. By combination of t.l.c., g.l.c. and mass spectrometry, the first group were found to consist of cycloartenol and 24-methylenecycloartenol, the second group of 24-methyl-lophenol, 24-ethyl-lophenol, 24-methylenelophenol, 24-ethylidenelophenol, obtusifoliol, 4α-methylzymosterol and cycloeucalenol. The third group of true phytosterols consisted of cholesterol, campesterol, stigmasterol, β-sitosterol, fucosterol, 28-isofucosterol and 24-methylenecholesterol. Possibly present also in this group were 7-ene-cholestenol, 7-ene-campestenol, 7-ene-22-dihydrostigmastenol, 7-ene-24-methylenecholestenol and 7-ene-isofucostenol.