concentrating proteins

[Joseph Booth]

Hi!

	I've read that you can concentrate a dilute solution of proteins through 
the addition of dry G25 Sephadex. I was wondering if anyone who has used 
this method could comment on how effective it is or if there are any 
disadvantages (like binding of the protein to the beads) that I should be 
aware of. Also, any alternative suggestions for a gentle method of 
concentrating proteins would be appreciated. Thanks.

Joe