分段萃取 meaning in English

stage extraction

We got 4 parts from the extraction of astragalus variabilis bunge through systemic research ways of phytochemistry , which respectively are the part of petroleum ether , the part of petroleum ether , the part of etoa and the part of n - buoh the part of n - buoh are isolated by the successively methods of silica - gel column chromatography , tlc and sublimation
摘要采用植物化学成分系统研究的方法，从变异黄芪醇提总浸膏中分段萃取得到石油醚提取部分、氯仿提取部分、乙酸乙酯提取部分和正丁醇提取部分。