以不同体积比的乙醇和乙酸乙酯分级溶解方法，分离出了几种不同分子量的腐殖酸。
Several humic acids of different molecular weight were fractionated by means of fractional solution containing various volume ratios of ethanol and ethyl acetate.
首先按照溶解度对条件培养基进行分级，结果显示其肿瘤抑制活动能够划分为细胞形成不可溶部分与细胞毒性可溶部分。
Fractionating the conditioned medium first by solubility revealed that its tumor suppressive activity could be divided into a morphogenic insoluble fraction and a cytotoxic soluble fraction.
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