Abstract The essential oils obtained from the leaf of Syzygium hancei Merr. & Perry, Syzygium caryophyllatum (L.) Alston and Syzygium lineatum (DC.) Merr. & Perry were analysed using gas chromatography flame ionization detector (GC-FID) and gas chromatography coupled with mass spectrometry (GC/MS). The yields of the essential oils were 0.15, 0.18, and 0.15 (v/w) respectively, calculated on a dry weight basis. The main constituents of the oils were γ-guaiene (11.07 %), β-caryophyllene (9.11 %), cis-calamenene (7.46 %), α- copaene (6.97 %), trans-cadina-1,4-diene (5.09 %) were identified in the leaf of S. hancei. β-caryophyllene (42.53 %), (E)-β-ocimene (19.38 %) and α-humulene (5.37 %) were identified in the leaf of S. caryophyllatum. β- caryophyllene (64.53 %), α-pinene (6.14 %), α-selinene (4.76 %) and α-humulene (4.39 %) were identified in the leaf of S. lineatum. The chemical constituents of essential oils from the leaf of S. hancei and S. lineatum are being reported for the first time. The β-caryophyllene content found S. caryophyllatum in Vietnam was higher than in other region. S. lineatum with a large percentage of β-caryophyllene could be a source to exploit this compound.

中文翻译：

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蒲公英叶精油分析。& Perry, Syzygium caryophyllatum (L.) Alston 和 Syzygium lineatum (DC.) Merr。& Perry 来自越南

摘要 从丁香叶中提取的精油。& Perry, Syzygium caryophyllatum (L.) Alston 和 Syzygium lineatum (DC.) Merr。& Perry 使用气相色谱火焰离子化检测器 (GC-FID) 和气相色谱与质谱联用 (GC/MS) 进行分析。按干重计算，精油的产量分别为 0.15、0.18 和 0.15 (v/w)。油类的主要成分为 γ-愈创木烯 (11.07 %)、β-石竹烯 (9.11 %)、顺式马铃薯烯 (7.46 %)、α-可帕烯 (6.97 %)、反式 cadina-1,4-二烯 (5.09 %) 在 S. hancei 的叶子中被鉴定。在石竹叶中鉴定出 β-石竹烯 (42.53 %)、(E)-β-罗勒烯 (19.38 %) 和 α-葎草烯 (5.37 %)。β-石竹烯 (64.53 %)、α-蒎烯 (6.14 %)、α-硒烯 (4.76 %) 和 α-葎烯 (4. 39 %) 在 S. lineatum 的叶子中被鉴定。S. hancei 和 S. lineatum 叶精油的化学成分首次被报道。越南石竹中β-石竹烯含量高于其他地区。含有大量 β-石竹烯的 S. lineatum 可能是开发这种化合物的来源。