The glucoamylase was extracted and purified by PEG/(NH4)2SO4 double aqueous phase system.
利用PEG/（NH4）2SO4双水相系统从粗酶液中提取糖化酶。
The extraction separation behaviour of lead with(NH4)2SO4-tetrabutylammonium bromide(TBAB)-H2O system and the conditions for the separation of lead with other metal ions are studied.
研究了硫酸铵-溴化四丁基铵（TBAB）-水体系萃取分离铅的行为及其与常见离子的分离条件。
Methods a combination of euglobulin precipitation, ion-exchange chromatography, (NH4) 2so4 precipitation and affinity chromatography was used in the process of purification.
方法采用优球蛋白沉淀、离子交换色谱、(NH4) 2so4沉淀和亲和色谱法进行纯化。
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