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The volatile components of the essential leaf oil of Zanthoxylum avicennae (Lam.) DC (Rutaceae) from Nghean province (Vietnam) were analyzed by means of capillary GC and GC-MS as well as in some cases by background subtraction of co-eluting compounds. Out of more than fifty identified compounds, the sesquiterpene hydrocarbons β-caryophyllene (17.01 %) and α-humulene (10.38 %) as well as the monoterpene hydrocarbons α-pinene (10.07 %) and β-phellandrene, were determined to be the major individual constituents of the essential oil. Further mono- and sesquiterpene hydrocarbons, such as α-terpinene, (E)-β-ocimene, λ-terpinene, germacrene D and β-selinene, were found in concentrations higher than 3.0 %.
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Đài et al. (2012) studied this question.
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