Volatile constituents from the leaves of four Libanothamus species from the Venezuelan Andes

摘要

The essential oil from the leaves of Libanothamus humbertii Cuatr., Libanothamus lucidus (Aristeg)Cuatr., Libanothamus nerifolia (B. ex H)Ernst, and Libanothamus occultus(Blake) Cuatr, collected in the Andes near Merida, were obtained by hydrodistillation. The oil yield varied between 0.05% and 0.13% and monoterpene hydrocarbons consituted 83.6-90% of the oils. Limonene (19.4%) is the most abundant component in L.humbertii, #alpha#-thujene (30.2%) in L.lucidus, sabinene (25.6%) in L.nerifolia and #alpha#-pinene (31.3%)in L. occultus.