helenium

1.A tall, coarse plant(Inula helenium) native to central Asia, having rayed yellow flower heads. The roots are used medicinally.

欧洲南部终年草本植物，有窄子和黄，黑色胡萝卜似的根部可食用。

2.Objective:to study the chemical constituents of the essential oil of Inula helenium L.were extracted by steam distillation(SD)and supercritical-CO2 fluid(SFE).

研究土木香挥发油的化学成分,水蒸气蒸馏提取(SD)与超临界CO2萃取(SFE)所得土木香挥发性成分的差异。