Originally posted by wanghing at 2010-10-29 13:24:54:
做反应首先要确定你的反应是不是完全，还有反应生存的东西是不是你所要的。

Originally posted by zlhcool123 at 2010-10-30 14:38:26:
竹红菌素在DMSO中溶解度好！可以在DMSO中做重结晶！具体方法是：取一定体积的DMSO往其中加竹红菌素，并且加热至100度使其完全溶解！置于冰箱中！应该就可以了！

Originally posted by 无涯天空 at 2010-11-02 12:13:04:
换溶剂结晶啊，溶剂选择不对，乙醇溶解性太好了，是要试管测试来确定结晶溶剂的……

Originally posted by hmmhll at 2010-11-08 10:17:35:

换结晶溶剂时取多少样品合适呢？

Originally posted by hmmhll at 2010-11-08 10:16:26:

100度会不会太高了？我前边的一个师兄认为竹红菌素A超过60度会发生变化

Originally posted by zhchem at 2010-11-10 14:03:05:
我有经典的重结晶书籍
已经传到纳米盘
http://d.namipan.com/d/a23e01436 ... 7f723445110ced44700
下载好好研读吧！！！！

Originally posted by 无涯天空 at 2010-11-08 12:37:08:

0.1g 就行，有时需要米粒那么大样品也可以，0.1g样品不能多于5ml