Essential Oils of Phoebe angustifolia Meisn. , Machilus velutina Champ. ex Benth. and Neolitsea polycarpa Liou (Lauraceae) from Vietnam

The essential oils of the leaves of Phoebe angustifolia Meisn, Machilus velutina Champ. ex Benth and Neolitsea polycarpa H. Liu., were analyzed by gas chromatography (GC) and gas chromatography coupled with mass spectrometry (GC-MS). The major compound found in the oils of Phoebe angustifolia were n -hexacadecanoic acid (13.0%), spathulenol (17.0%), sabinene (6.0%), artemisia triene (5.1%) and bicyclogermacrene (5.9%). Appreciable quantities of ( E )-β-ocimene (9.5%), ( Z )-β-ocimene (8.2%), germacrene D (6.8%), allo-ocimene (6.4%), α-phellandrene (5.9%), β-caryophyllene and bicyclogermacrene (ca 5.5%) could be identified from Machilus velutina . However, we have identified ( E )-β-ocimene (85.6%) as the singly abundant constituent of Neolitsea polycarpa with significant amounts of limonene (6.5%). Apart from allo-ocimene (1.8%) and spathulenol (1.1%), the other nineteen compounds were identified in amount less than 1%. This is the first comprehensive report on the volatile oils of the studied species.