Abstract Lipophilic extractives in the dichloromethane extract from Eucalyptus pellita wood and bark were identified by GC-MS. Of the various morphological parts, the bark samples contain more extractives than wood samples. The largest extractive content was measured in the bark of the top part. Four groups (i.e., free fatty acids, sterols-steroids, triterpenoids, and other compounds) were detected in all parts. Palmitic, oleic, and linoleic acids as well as β-sitosterol dominated among of the lipophilic extractives. Long chain fatty acids were the major lipophilic groups in heartwood. Sterols-steroids were the major components in the bottom and top part of the bark. Conversely, triterpenoids and short chain-fatty acids were the minor components in bottom and top part of the bark. Very long-chain fatty acids (i.e., docosanoic, lignoceric, and hexacosanoic) were also observed. The concentration of certain lipophilic constituents, e.g., stigmast-4-en-3-one, squalene, glycerol, oleic, linoleic, hexacosanoic, and β-sitosterol, was affected by position within the tree in axial and radial directions. The higher concentration of long chain fatty acids in the heartwood as well as sterols-steroids in the bark seems to be clearly disadvantage as far as pitch formation is concerned.

中文翻译：

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来自印度尼西亚 Merauke 的 Eucalyptus pellita F. Muell 木材和树皮的亲脂性提取物

摘要 GC-MS 鉴定了桉树木材和树皮二氯甲烷提取物中的亲脂性提取物。在各种形态部分中，树皮样品比木材样品含有更多的提取物。在顶部的树皮中测量到最大的提取物含量。在所有部位均检测到四组（即游离脂肪酸、甾醇类固醇、三萜类化合物和其他化合物）。棕榈酸、油酸和亚油酸以及 β-谷甾醇在亲脂性提取物中占主导地位。长链脂肪酸是心材中的主要亲脂基团。甾醇类固醇是树皮底部和顶部的主要成分。相反，三萜和短链脂肪酸是树皮底部和顶部的次要成分。极长链脂肪酸（即二十二烷酸、木质素酸、和六十二烷酸）也被观察到。某些亲脂性成分（例如 stigmast-4-en-3-one、角鲨烯、甘油、油酸、亚油酸、六十二烷酸和 β-谷甾醇）的浓度受树内轴向和径向位置的影响。心材中高浓度的长链脂肪酸以及树皮中的甾醇-类固醇的浓度就树脂形成而言显然是不利的。