关键词: 甘肃大戟, 乳浆大戟, 钩腺大戟, 总脂含量, 脂肪酸

Abstract: Total lipid contents in different tissues from three Euphorbia lathyris L.related species including E.kansuensis Prokh., E.esula L. and E.sieboldiana Morr. & Decne. were determined by Soxhlet extraction method. Relative contents and composition of fatty acids in their seed oils were analyzed by gas chromatography. The results showed that total lipid contents werehighest in the seeds of these three species (37.29%, 24.50% and 24.85%, respectively), lower in leaves and stems, and lowest in seed shell. E.kansuensishad good potential for development as itshigh seed oil content of 37.29%. Total contents of fatty acids (<20 carbon atoms, mainly C18-fatty acids) in their seed oils were over 90%, and even over 99% in E.kansuensis. The carbon chain length of the fatty acids was quite similar with that of the ideal biodiesel, but linolenic acid content was above 53% of total lipid, which would result it in reduced stability of the produced biodiesel.

Key words: Euphorbia kansuensis Prokh., E.esula L., E.sieboldiana Morr. &, Decne., total lipid contents, fatty acid