guanidine and isopropanol freeze solid - why?

[jon at molbiol.net]

Precipitate in an ice bath then....besides, GCN comes out of solution at low temperatures...esp. if its in a saturated solution, which in your case it probably is in the (aq) phase...

Jacob Hofma-Bang wrote:

> Hi.

> Doing RNA extraction with guanidine thiscyanate and phenol, I precipit with  
> isopropanol. However it freezes solid at -20 C.

> Any suggestions?

> Jacob Hofman-Bang, Ph.D.
> SSI





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