problems of dialysis...

Dr E. Buxbaum EB15 at
Fri May 16 08:53:54 EST 1997

mange at wrote:
>We are trying to purify a transcription factor on streptavidin
>magnesphere. After one passage on magnesphere, we will have to dialyse the
>proteins at 4°C and for a short period...does anyone have any suggestions
>for this last step (centricon, dialysis tubing...)?

You do not state which volume of sample you want to handle, but I suspect 
it will be rather small. In such cases I had good success placing the sample 
into the lids of Eppendorf vials. The conical part of the vials have to be cut 
of first. You then span the dialysis membrane over the rim of the vial lid 
and close the ring which remained from the vial over it. This gives you a 
dialysis chamber of approx. 300 ul for a 1.5 ml vial, and about 100 ul for 
the 0.5 ml vial. 

Remember to boil the dialysis membrane in 100 mM NaHCO3, 10 mM EDTA before 
using it to remove contaminants, in particular proteolytic enzymes. The 
prepared membranes should be handled with gloves only, they can be stored 
in 20% ethanol.

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