The phase separation conditions for aqueons two - phase system based on polyethylene glycol ( PEG ) 1500 - polyvinyl pyrrolidone ( PVP ) 30,000 - Salt - H 2 O were examined.

通过实验选择聚乙二醇(PEG1500 ) 与聚乙烯吡咯烷酮 ( PVP30 000)组合表面活性剂 ( NH4 ) 2 SO4 H2O形成双水相体系及其成相条件.

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