Chemical composition of essential oils of Rhodamnia dumetorum (Poir.) Merr. & Perry and Syzygium zeylanicum (L.) DC.

Abstract

Chemical compositions of essential oils obtained from the leaf of Rhodamnia dumetorum and Syzygium zeylanicum were reported, corresponding oil content 0.82 and 0.12%. The analysis was performed by means of Gas chromatography-flame ionization detector (GC-FID) and Gas chromatography coupled with mass spectrometry (GC-MS). Sixteen components were identified in leaf oil of R. dumetorum, which presented about 99.99% of the total composition of the oil. The major constituents of the essential oil were α-pinene (90.47%), β-caryophyllene (3.65%), Limonene (1.41%), β-pinene (1.03%). Fifty-six components were identified in leaf oil of S. zeylanicum, which presented about 98.19% of the total composition of the oil. The major constituents of the essential oil were Bicyclogermacrene (25%), β-caryophyllene (20.14%), α-pinene (7.66%), α-humulene (4.25%), δ-cadinene (3.47%), (E,E)-α-farnesene (2.82%), (E)-β-ocimene (2.44%), (E,Z)-farnesol (2.25%), α-amorphene (2.05%). Essential oils of R. dumetorum and S. zeylanicum may be active against gram-positive and gram-negative bacteria as well as against the fungi and insects. For the first time, the chemical compositions of the essential oils of R. dumetorum and S. zeylanicum from Vietnam were reported.