Size-Fractionation of DNA

"Marianne Leverone ", BIO leverone at CHUMA.CAS.USF.EDU
Wed Oct 18 07:48:28 EST 1995

Bob:  I have used a CL-4B column to remove RNA from plasmid preps and the 
method worked well with high yields.  I don't know about the size limits of 
this matrix.  Look in a catalogue that sells the stuff and it will tell 
you what sizes of DNA that can be isolated.  I always thought that it 
could not be used to size fractionate DNA, say for producing a library, 
because the plasmid isolation was based on the plasmid not getting 
trapped in the matrix but smaller, linear pieces did get trapped.  How 
about it gang?  Does anyone else know?  Marianne Leverone, Biology Dept., 
Univ. of South FLorida, Tampa, FL.

On Mon, 16 Oct 1995 colvin at wrote:

> Before subclonning ds DNA generated by PCR into a plasmid, I would like to 
> remove small DNA fragments.  The template used for PCR was a subtracted cDNA
> library, so there are many different sized fragments present.  One method
> that I am aware of is to use a sepharose CL-4B column.  Have others used this
> method with success?  Are there other methods that are simple, but still give
> good recovery?  Thank you.
> Bob Colvin, Dept. Biological Sciences, Ohio Univ. Athens, OH, USA
> colvin at

More information about the Methods mailing list