In order to provide a basis for the research and development of gromwell,the studies on domestic extraction of alkannin was reviewed in briefly.

对有关紫草色素的概况进行了综述,为研究和发紫草供依据。

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然紫草色素的工艺条件,超声波法可明显高色素的速率。