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[求助] 蛋白酶水解相关问题:关于酶解时ph2.0的调节,体积可能会变化,请问应该怎么回答呢

最近写了一篇关于酶解粗提物后分离纯化的文章,在酶解的时候,我们用NaOH和HCl调节ph的时候,体积问题,审稿人提了这样的一个问题

The enzymatic hydrolyses have different pH (neutrase at pH 8.0, alcalase at pH 8.0, pepsin at pH 2.0, and papain at pH 6.0). How the pH was adjusted? Was it done after dissolving the sample in the phosphate buffer solution? In this case the final volume would change especially for pepsin with a pH of 2. Please explain.
我的PH2.0用的是0.1M的甘氨酸-HCl缓冲液
不知道该怎么回答,请教一下各位
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