Abstract
The composition of triterpene alcohols and sterols in the fraction of Siberian larch (Larix sibirica Ldb.) conifer needles is considered in paper. The needles areextracted with propan-2-ol; resinous substances are extracted with petroleum ether (40–70°C);substances extracted with petroleum ether are divided into free acids and neutral substances. Neutral substances are separated in a silica gel column; eluent - petroleum ether supplemented with diethyl ether. The isolated esters fraction is hydrolyzed with potassium hydroxide in ethanol, and the “bound” acids are separated from unsaponifiable substances. Non-saponified substances are separated by chromatography into 5 fractions of phytosterols, the alcohol components of esters. The fractions are acetylated; the alcohol acetates are separatedonsilica gel with added silver nitrate. The isolated compounds was identified by NMR and GC-MS methods. Cycloartenol (6.82%, hereafter based onunsaponifiable substances), 24-methylenecycloartanol (6.75%), citrastadienol (7.69%), sitosterol (7.18%), cycloevcalenol (0.09%) are identified, obtussifoliol (0.01%), 24-methylenelophenol (0.10%), methyllophenol (1.84%) and campesterol (0.33%).
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