Q: purifying lambda phage from extraneous DNA

Dr. Duncan Clark duncan at genesys.demon.co.uk
Fri Feb 7 11:16:51 EST 1997

In article <jpcd0-0702971512460001 at mje-mac5.welc.cam.ac.uk>, John Dixon
<jpcd0 at mole.bio.cam.ac.uk> writes
>Can you PEG ppt a dilute lambda library and resuspend in a smaller volume
>of SM buffer and use it without worrying about the higher PEG

It was a only a thought. Would the PEG really be too high for infection.
There is a protocol for making E.coli competent with PEG at I think a
final concn of 10% or so. If that is the case a little bit of PEG
shouldn't hur  

>Some of my older library stocks seem to be dwindling in titre and are now
>too dilute, but I have enough mls to reconstitute it if I could
>concentrate it down to 1ml from 50 or so mls. 

What about putting them a dialysis tube and concn. against solid PEG.
The PEG will not go across the membrane but watch it closely - it is
very easy to concn. to dryness!!


The problem with being on the cutting edge is that you occasionally get 
sliced from time to time....

Duncan Clark
DNAmp Ltd.
TEl/FAX 01252376288

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