五种大戟科植物种子的脂肪酸的结构鉴定_喻学俭 . STRUCTURAL DETERMINATION OF FATTY ACID COMPONENTS IN THE SEED OILS OF FIVE SPECIES OF EUPHORBIACEAE

Abstract

The fatty acid components of the seed oils of five species of Euphorbiaceae collected in Xishuanbanna district,Yunnan province—Aleurites montana(Lour.)Wis.,Mallatus paniculatus (Lain.)Muell-Arg.,Ostodes paniculata Bl.,Mcaranga denticulata(Bl.)Muell-Arg.,and Tre- wia nudiflora L.-have been analyzed.Long-chain fatty acids were first converted to corres- ponding 2-substituted 4,4-dimethyloxazoline derivatives(DMOX)by condensing with 2-amino- 2-methylpropanol(AMP)and subsequently analyzed by GC-MS.The position of unsatura- tion(double and triple bonds)and substituents(e.g.,hydroxyl)in the aliphatic chain can easily be located by interpreting the mass spectra recorded in this way.The qualitative as well as quantitative results can be provided for all constituents in a single GC-MS run.This me- thod proves simple and efficient,with good reliability,and is well suitable for the structure determination without reference specimens.