Phosphorothioate oligos

Mark Mattson mpm at
Fri Jul 8 09:20:09 EST 1994

Karen Gravitt (krg at wrote:
: I have another question regarding oligonucleotides.  I am having trouble 
: getting my phosphorothiated 20mers (one set is complete and the other is only 
: phosphorothioated on only two bases)  in solution---I have tried sterile water 
: and have had no luck, is this normal or what else should I try?????

Dear Karen,

I have had no trouble dissolving phosphothiolated oligos in water.  Maybe
you have impurities that are interfering?  We run all our oligos through
Sep-Pak reverse-phase (C18, I think?) columns in acetonitrile or MeOH 
(eluting with water).

Steven W. Barger, Ph.D.
Sanders-Brown Center on Aging

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