Chemical composition of leaf and stem oils from Vietnamese Cupressus tonkinensis Silba.
Résumé
Cupressus tonkinensis was treated for a long time as a synonym of Cupressus torulosa D. Don. and it was proposed as new species in 1994. The two species differed by morphological characters and they were distinct in their random amplified polymorphic DNAs (RAPDs). Leaves and stems of C. tonkinensis produce monoterpene-rich oils whose composition is investigated here for the first time by combination of chromatographic and spectroscopid techniques. a-pinene (23.1%), sabinene (21.0%) and terpinen-4-ol (14.4%) were the major components of the leaf oil that contained also b-elemol (4.2%). In contrast, a-pinene (42.5%) was by far the major component of the stem oil beside myrcene (10.2%) and cedrol (9.0%).