Solution polymerized styrene-butadiene rubber (S-SBR) was fractionated by repeated precipitation method, using redistilled toluene as solvent and ethyl alcohol as precipitant.
本工作用甲苯作溶剂，乙醇作沉淀剂，用沉淀分级法，对溶聚丁苯橡胶（S-SBR）进行了分级。
The high vinyl 1, 2-polybutadiene was fractionated by the step precipitation method, and the weight average molecular weight (Mw) and the intrinsic viscosity ([η]) of various fractions were determined respectively by the small angle laser light scattering and viscometry.
采用逐步沉淀分级法对钼系1,2-聚丁二烯（1,2-PB）试样进行了分级，用小角激光光散射法和粘度法分别测定了各级分的（？）
Fractionated soy protein product I with enriched glycinin and fractionated soy protein product ⅱ with enriched β - conglycinin were obtained by alkali extraction of defatted soy flour and then precipitation under selected conditions.
利用〃碱溶酸沉〃方法，得到富含大豆球蛋白的大豆分级蛋白产品Ⅰ和富含β-伴球蛋白的大豆分级蛋白产品Ⅱ。
In order to obtain homogenous fractions, water soluble pentosans (WSP) and water insoluble pentosans (AEP) prepared from wheat bran were fractionated by stepwise ethanol precipitation and DEAE cellulose column chromatograph. The composition of each pentosan was analyzed.
用乙醇逐步沉淀和离子交换柱层析方法对麸皮中制备的水溶戊聚糖（WSP）和水不溶戊聚糖（AEP）进行分级纯化，并对各组分的组成进行了分析。
Therefore, in this study, ACE was fractionated from pig's lung organism, with the method of ammonium sulfate precipitation and salting out, whose enzyme activity was tested to be 15.45×10-3 U/mg, and the specific activity was 33.80×10-3 U/mg.
但ACE成本昂贵，本文利用硫酸铵分级盐析法提取猪肺组织中的ACE，测其酶活力为15.45×10-3U/mg，比活力为33.80×10-3U/mg。通过卡托普利来验证其抑制效果，抑制率达49.15%。