1. In contrast with different extraction methods, the alkannin could be extracted quickly and effectively by the ultrasonic wave.
   研究了超声波法和有机溶剂法提取天然紫草色素的工艺条件,超声波法可明显提高色素的提取速率。
2. In order to provide a basis for the research and development of gromwell,the studies on domestic extraction of alkannin was reviewed in briefly.
   对国内有关紫草色素提取的概况进行了综述,为研究和开发紫草提供依据。

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