![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
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.