Essential oil compositions from stems and fruits of piper maingayi hk

摘要

GC and GC-MS analysis of essential oils obtained from the hydrodistillation technique by using Dean-stark apparatus of fresh stems and fruits of Piper maingayi Hk resulted in the identification of 34 and 18 components accounting for 83.6% and 80.4% of the total amount, respectively. Sesquiterpenes of both hydrocarbons and oxygenated, were the most highly represented classes as the former ranging from 64.7% to 70.7%, and the latter varying from 7.4% to 8.6%. The main constituents of stems essential oil were : β-caryophyllene (26.2%), α-cedrene (8.4%), caryophyllene oxide (6.7%) and cis-calamenene (6.2%), while the fruits essential oil was dominated by a-cadinene (22.6 %), β-caryophyllene (18.8%), α-copaene (11.2%) and a-cadinol (7.1%). The essential oils result of stems and fruits of P. maingayi Hk. were compared with the previous result from the leaves of the same species and proved the dominant constituents of essential oils from all three parts was the β-caryophyllene ranging from 18.8% to 39.6%.