Chemical compositions of the essential oil of Pinus kwangtungensis Chun ex Tsiang from Vietnam
Pinus kwangtungensis Chun ex Tsiang (Pinaceae) distributes in the Caobang, Hagiang, Hoabinh and Sonla provinces at 900-1400m alt.. The yield of the essential oil from leaves was 0.03 percent by air-dry material. This essential oil was analysed by GC/MS and 31 constituents of essential oil were identified. The main constituents of this oil were: a-pinen (16.41%), b-caryophyllen (14.50%), d-cadinen (8.09%), a-cadinol (7.59%), bicyclo [4.4.0] dec-1-en, 2-isopropyl-5-methyl-8-methylen (6.77%) and 1-limonen (6.65%).