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1·The rough extract of Pinggu mushroom PPO was obtained by ammonium sulfate precipitation method.

采用硫酸铵沉淀法得到平菇多酚氧化酶粗提液。

2·The enzyme is crushed in osmotic pressure process, and purified in ammonium sulfate precipitation and chromatographic process.

酶经渗透压法破碎、硫酸铵沉淀和柱层析纯化。

3·Conclusion: Purified protein and its amino acids were obtained by defatted ammonium sulfate precipitation procedure, and the content of protein was acceptable. This method is easily and more feasible.

结论：采用脱脂硫酸铵沉降法提取所得总蛋白及其所含氨基酸含量较高、纯度较合理，方法较可行。

4·High purity ovotransferrin was extracted from albumen by precipitation with ammonium sulfate and ion exchange chromatography in the study.

采用硫酸铵沉淀法和阴离子交换层析法从鸡蛋清内提取高纯度卵铁传递蛋白。