How do you make Deionized foramide?

M K Bennett pamkb at
Mon Apr 11 06:58:18 EST 1994

Michael Coady (coady at ERE.UMontreal.CA) wrote:
: In article <2o3hkm$p6b at> mlush at (Mr. M.J. Lush) writes:
: >
: >	The subject says it all really,  we want it for Southern
: >and Northen work,   and are tired of having to wait for it from 
: >CloneTech,  (lower cost would be another plus point...)
: >

: 	According to Maniatis, just sit your formamide with
: Dowex XG8 mixed-bed resin for one hour and filter twice through
: Whatman #1 paper.  Store deionized formamide in small aliquots
: under nitrogen at -70 C. Another resin is Bio-Rad's AG501-X8(D )
: (20-50 mesh).  Use 5 g /100 ml.

: Mike

: P.S.  This stuff is in every basic lab book, like Maniatis or
: Current Protocols or Met. Enzymol. 152.  It's pretty easy to
: find, and you'll probably feel more confident seeing it there
: rather than in one of the postings here.

: -- 
: Michael J. Coady
: The opinions expressed above are solely those of the author and do not,
: in any way, shape or form, represent the Universite de Montreal.

This probably goes against the grain somewhat but I find that most of the
formamide that you buy doesnt need to be deionised unless it has a slight
yellow colour to it.  I generally dont bother and have had no problems
with my Northerns or Southerns.


Mike Bennett
University of Bristol
m.k.bennett at

More information about the Methods mailing list