Peptide in solution

[Dr Engelbert Buxbaum]

Am 06.05.2009, 12:35 Uhr, schrieb Yvonne Couch  
<yvonne.couch from pharm.ox.ac.uk>:

> I have a peptide dissolved in PBS at 1mg/ml, I want to concentrate it,  
> is it
> possible to get the peptide out of solution in order to concentrate it?

Put the solution into a dialysis bag and put some PEG 20,000 outside. The  
stuff is hygroscopic and sucks the water out of the bag. Dry Sephadex  
works to, but is more expensive. Just look after the thing from time to  
time, you don't want all the water removed from your sample.

Centrifugal concentrators (e.g. Millipore) or Amicon pressure cells also  
work.