Abstract:

The components and content percentage of volatile oils in Xinyi (flower bud) of 10 Chinese species of Yulania of Magnliaceae were analyzed by using GC/MS method, and 7 species among them were first reported, which were Yulania axilliflora(Magnolia axilliflora), Y.henanensis (M.henanensis), Y.elliptilimba (M.henanensis), Y.wugangensis (M.wugangensis), Y.dimorpha sp.nov.ined., Y.pilocarpa(M.pilocarpa) and Y.jigongshanensis(M.jigongshanensis) . The results showed that there were 84 compounds in these volatile oils, each species had 36～56 compounds, 62 compounds were identified and their total content was 98.4%. There were 17 compounds owned by all species and their total content was 72.9%. The main compounds were eucalyptol, sabinene, β-pinene, myrcene and α-terpineol. The percentage of eucalyptol content usually was more than 20%, and the highest 35.5%. There were 5 compounds were first reported in the volatile oils of Yulania species, which were 1-hydroxy-1 7-dimethyl-4-isoprophy-2,7-cyclodecadiene owned by all species, α-zingiberene, germacrene B, β-sesquiphellandrene and hedycaryol non-owned-by-all. Moreover author pointed out that Y.henanensis and Y.elliptilimba are hybrid and may have the same origin. Based on myrcene and hedycaryol with their phylogenitic implication, 10 species can be divided into two groups. One group included Y.soulangiana, Y.denudata, Y.wugangensis, Y.dimorpha, Y.pilocarpa and Y.jigongshanensis, whose percentages of myrcene and hedycaryol content were more than 6% and 1% respectively. The other group included Y.biondii, Y.axilliflora, Y.henanensis and Y.elliptilimba, whose percentage of myrcene content was less than 2.0%, and didnt have hedycaryol.

Key words: Magnoliaceae, Yulania genus, Component of volatile oil, chemical classification