precipitating proteins w/ ethanol

Jee-Yeong Jeong jeong at biochem.purdue.edu
Fri Mar 5 10:52:57 EST 1999

Hi. The EtOH ppt is of course a good choice, but it is sometimes
inconvenient; for example, if you have 0.8ml of sample in 1.5ml tube, you
need to transfer the sample to a larger tube to add 2-3 Vol of EtOH. In this
case I usually use the TCA precipitation followed by acetone washing. This
might be a classical method for protein ppt before SDS-PAGE, but it worked
well always. If you need detailed information let me know.

Katherine Walstrom wrote:

> I have some dilute protein samples that I need to concentrate and run on
> an SDS-PAGE gel.  I can't find a detailed protocol for precipitating
> proteins, although what I've read suggests that ethanol works well.  I
> want to precipitate all the proteins, not just selectively precipitate
> some of them.  Does anyone have a general protocol for this?
> Thanks much.
> Katherine M. Walstrom, PhD
> Division of Natural Sciences
> New College of USF
> 5700 N. Tamiami Trail
> Sarasota, FL  34243
> kwalstro at sar.usf.edu

Jee-Yeong Jeong
Graduate Research Assistant
Department of Biochemistry
Purdue University
Hansen Life Science Research Building, Room 225
West Lafayette, IN 47907
Tel (765) 494-6591          Fax (765) 494-7897
Email: jeong at biochem.purdue.edu

More information about the Methods mailing list

Send comments to us at biosci-help [At] net.bio.net