the problem is, in many cases, enzyme introduces other reactions to the system.
If an enzyme only catalyses the process of R<->S, it cannot help to get pure R. But, if the enzyme has 2 domains, domain 1 catalyses R<->S, the other domain selectively bind to R instead of S (enzymes are chiral). Then the reaction changes from
R+S<->R
to
R+S+E<-> ER

Then you use other way to separate R from ER.
【 在 slimewoo (slimewoo) 的大作中提到: 】
: 那么是否能够存在这么一个酶，因为这个酶的加入，改变了体系的熵，使得逆消旋化能够自发进行？
: 但是这样就似乎违背了酶作为催化剂不改变化学反应本质的概念了。
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