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[求助] 胶原蛋白提取疑惑,求高手指点。。

一、 The mixture was filtered through two layers of cheese cloth and the residue was re-extracted under the same conditions. Both filtrates were combined. The collagen was precipitated by adding NaCl (powder) to a final concentration of 2.6 M in the presence of 0.05 M tris(hydroxymethyl) aminomethane, pH 7.0.(前文是经过滤得到滤液)
  1. 求第二句翻译,主要是添加顺序不清楚
  2. tris添加量是多少,其作用是什么
  3.这里的pH 7.0是指 tris 的吗
      
     二、在使用胃蛋白酶酶提取胶原蛋白后,不灭酶可以吗?如果一定要灭,什么时候最好(盐析?透析?)。。。
                                   谢谢各位的解答!!

[ Last edited by 红舟流星 on 2013-9-26 at 13:01 ]
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