Comparative study of essential oil constituents of Bupleurum species from Mongolia

Essential oils have been isolated from the Mongolian plant species Bupleurum scorzonerifolium Willd, Bupleurum sibiricum Vest and Bupleurum multinerve DC by a hydro distillation method. The compositions of the essentials oils were analyzed by GC and GC-MS methods. Indicating the following main constituents: limonene (15.21%), p-cymene (11.54%), (E)-β-ocimene (10.50%), myrcene (8.09%), sabinene (6.56%), α-pinene (6.33%), germacrene-D (4.08%), β-pinene (3.13%), δ-cadinene (2.73%), spathulenol (2.71%) and caryophyllene oxide (2.53%) for B.scorzonerifolium; caryophyllene oxide (16.97%), spathulenol (7.25%), pentodecane (6.33%), α-pinene (4.20%), limonene (3.30%), myrcene (3.09%), cis-carvylacetate (1.69%) and β-cubebene (1.43%) for B.sibiricum; germacrene-D (19.41%), (E)-β-ocimene (18.63%), myrcene (9.13%), limonene (7.81%), E-caryophyllene (4.60%), sabinene (2.80%), β-elemene (2.72%), bicyclogermacrene, β-pinene, γ-terpinene, (Z)- β-ocimene (2.00-2.10%), and caryophyllene oxide (1.11%) for B.multinerve.