Protein Purification Help

[Dr E. Buxbaum]

If dialysis worked fine in the past, it may well be a good idea to stick 
with it: Never change a working system!

However, buffer exchange is possible by gel chromatography. You 
equilibrate the column with your second buffer, apply the sample (in the 
first buffer) and elute with the second one. The protein will elute from 
the column in the buffer which was used to equilibrate it.

If you are unsure about chromatographic techniques, the best source of 
informations are the booklets published by Pharmacia, and available free 
from your lokal representative. I am normaly not too keen on all the 
paper which supply companies try cover my desk with, but that series of 
booklets is a definite exception.