Fisher Taq shipped on dry ice

Todd Richmond todd at
Thu Feb 8 11:03:58 EST 2001

In article <95udqn$6c7$1 at>, "Ken Soderstrom" 
<soderstrom at> wrote:

> I just got 100U of Taq from Fisher that arrived frozen solid on dry ice.
> I'm worried about the effect of freezing on its activity.  I hate to 
> waste
> my time proving to Fisher that this is a bad idea.  Their tech support
> claims that this is thier standard shipping method which doesn't seem 
> right.
> Does anyone out there know if its OK to freeze Taq.

That's the standard way we store Taq for long-term storage. It's a bad 
idea to freeze Taq polymerase during the purification process, but once 
it's in 50% glycerol (storage buffer) it's fine for several years.


Dr. Todd Richmond
Carnegie Insitution, Dept of Plant Biology
260 Panama Street
Stanford, CA 94305

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