Retrieval of ssDNA from a mixture of ssDNA/dsDNA

Allen Gathman C741SCB at SEMOVM.SEMO.EDU
Wed Mar 15 11:40:24 EST 1995

In article <3k4d8c$mim at> jsasse at (Mr. J. Sasse) writes:
>Hello netters,
>I would like to separate and retain ssDNA from a mixture of ssDNA and
>dsDNA which is in aqueous solution. The ssDNA I particularly want to keep
>is a 50-55mer. Does anybody have any ideas?
>Jurgen Sasse                 email:js1 at
>Dept. Pathology                Tel:01223/333718
>Cambridge Univ.
>Cambridge, UK
How about using a small hydroxyapatite column? Hydroxyapatite binds
dsDNA more strongly than ssDNA; ssDNA elutes at 60 degrees in .12M
phosphate, while dsDNA elutes at the same temp in .3M phosphate.
See, maybe, Britten et al 1974, Methods in Enzymology 29E:363-406.

|    Allen Gathman                |                                    |
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