protein precipitation

[s.hannier at abdn.ac.uk]

I would like to concentrate a sample of proteins with less than 1 ug  (aout 900ng) in 1ml. What is the best precipitation method to use for a maximum recovery? I have heard about deoxycholate/TCA but it seems that recovery is 50% , which is not very good. Any advice?
Many thanks,
Sigrid

http://biowww.net/mynews/tree.php?group_name=bionet_molbio_proteins&begin=0