Chemical composition of essential oils isolated from leaves, twigs, and wood of Vietnamese Keteleeria davidiana (CEbertrand) Beissn

Keteleeria davidiana (C.E.Bertrand) Beissn. is a species of conifer native to southern China, Laos and Vietnam. The species has been listed as vulnerable in Vietnam. Essential oil samples have been isolated from leaves, twigs and wood, and their compositions investigated for the first time by combination of chromatographic and spectroscopic techniques [GC-FID, GC-MS and(13)C NMR]. The composition of leaf essential oil was dominated by alpha-pinene (28.1%), beta-pinene (15.8%) and (E)-beta-caryophyllene (13.8%). Twig essential oil contained mainly alpha-pinene (37.9%) and beta-pinene (24.7%) accompanied by (E)-beta-caryophyllene (8.3%) and beta-phellandrene (7.5%). Lastly, alpha-pinene (27.9%), alpha-terpineol (20.3%) and (E)-beta-caryophyllene (20.8%) were predominant in wood essential oil.