用乙醇改性的超临界CO2,经过压力分级步骤选择性萃取白术挥发油中的不同族组分，在低压（12.0 MPa）条件下完成对其中的β-榄香烯的萃取，并且将其在萃取物中的质量分数由高压下的4.8%提高到低压下的8.0%，萃取率达94.2%，同时降低了对设备的要求。
A method has been developed for the extraction and analysis of the active component β-elemene from Rhizoma Atractylodis Macrocephalae by supercritical fluid extraction with CO\-2 containing ethanol． The article discusses some factors such as pressure,temperature and modifier that affect the selectivity． Class-selective extraction has been performed by varying the pressure． β-Elemene could almost be extracted completely at lower pressure (12．0 MPa) and its relative amount was raised from 4．8% under higher pressure to 8．0% for lower pressure．
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