Characteristics of the two - phase aqueous and its extraction principle were introduced . a review was given on the application of the aqueous two - phase extraction , especially on domestic and international research . at the same time , the general rules of aqueous two - phase extraction were explored 本文介绍了双水相的性质及其萃取原理，介绍了双水相萃取的优越性，归纳了双水相萃取的应用领域，特别是对双水相的国内外研究进展进行了综述，同时对双水相萃取的一般规律进行了总结。
Finally glycyrrhiza as the raw material were extracted by the aqueous two - phase . the influences of the extraction time , temperature , the extractant ration ( filtrate / extractant ) , quantity ration were studied . the optimum condition was also determined 最后以甘草为原料，用双水相萃取技术提取甘草酸，对于不同分子量的聚乙二醇peg ，考察了提取时间、温度、萃取剂比例(滤液萃取剂)和双水相组分比聚乙二醇与硫酸铵质量比[ peg ( nh ) 4so4 ]对萃取量的影响，从而确定它们的最佳工艺条件。
