guanosine in agarose

Paul N Hengen pnh at
Tue Apr 15 12:27:33 EST 1997

brett (brett at BORCIM.WUSTL.EDU) wrote:

: I thought I'd try uv protecting my preparative gels as per Grundemann & Schomig 
: (BioTechniques, V21, p898). Anyone else out there using this method? If so,
: any suggestions on making up a guanosine stock solution (it saturates at ~2.6mM
: at 18oC)? Switch to cytosine?


I don't know why you want to make a concentrated stock solution for this.
Why not just add 2 mM guanosine to a liter of 1xTAE or 1xTBE, filter
sterilize, and store it in the fridge? Or, does that precipitate it?
You can e-mail Dirk (dirk.gruendemann at and see
what his experience is with it.  I can't imagine using so much in a
mini-gel system that this would be inconvenient to do every few weeks.
Oh, please let us know if you find it works for TBE buffered gels in
your hands too :-)

* Paul N. Hengen, Ph.D.                           /--------------------------/*
* National Cancer Institute                       |Internet: pnh at |*
* Laboratory of Mathematical Biology              |   Phone: (301) 846-5581  |*
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