Comparative Aroma Compound Analysis of Different Essential Oils of Lippia rugosa from Cameroon Using GC/FID,GC/MS and Olfactometry

摘要

The essential oils of flowers,steins,fresh old,fresh young and dried leaves of Lippia rugosa A.Chev.(syn.L.adoensis F.TW.A.,L.nigeriensis Moldenke) from Cameroon were analyzed by GC,GC/MS and olfactometry.The oils were characterized by a high percentage of oxygenated monoterpenes (18.6-93.1%),represented especially by geraniol (0.4-51.5%),linalool (4.6-32.9%),1,8-cineole (less than 0.1-19.1%),nerol (0.1-18.6%) and geranial (less than 0.1-16.5%).The main monoterpene hydrocarbons were identified as limonene (less than 0.1-37.8%),myrcene (lessthanO.1-14.1%),beta-pinene (less than0.1-6.5%),(Z)-beta-ocimene (not detected-3.3%),gamma-terpinene (less than 0.1-2.3%) and (E)-beta-ocimene (less than 0.1-2.2%).Sesquiterpene derivatives (hydrocarbons and oxygenated) were found in a lower concentration (together 3.3-28.0%),represented mainly by (E)-beta-farnesene (0.3-12.1%),germacrene D (1.2% and 4.2%),beta-caryophyllene (0.8-3.9%) isocaryophyllene oxide (less than 0.1-2.9%) and tau-muurolol (0.1-2.2%).