Chemical composition of the leaf oil ofZanthoxylum alatumRoxb. from Vietnam

The volatile components of the leaf oil of Zanthoxylum alatum Roxb. (Syn. Z. armatum DC; Z. bungeanum Maxim; Z. bungei Planch; Z . planspinium Sieb. et Zucc.) from the Northwestern Thanh Hoa province, Vietnam have been studied. The volatile oil was obtained from the dried leaves by steam distillation to produce an oil in (0.52%) yield. 50 compounds were identified and characterized constituting more than (98%) of this oil. The leaf oil was found to be rich in monoterpenes. Among the major component was 1,8–cineole (41.0%), other predominant were sabinene (8.4%), β-terpineol (2.1%), linalool (4.5%), terpinen-4-ol (5.2%), α-terpineol (4.1%), β-cymene (1.3%), 2,6-dimethyl-1,3,5,7-octatetraene (1.5%) and 2-tridecanone (1.8%).