From: Tom Laue <Tom.Laue@unh.edu>
  To  : 'Neil Errington' <neil.errington@nottingham.ac.uk>
  Date: Thu, 25 Jan 2001 12:46:22 -0500

RE: vbar of PEG

Hi Neil,
One of my students (Yatin Gokarn) measured the vbar of PEG (MW:5000) in
water and in 100mM NaCl, 50 mM Tris, pH 7.4 at 20 C using an Anton-Paar
density meter.
In water, the measured vbar was 0.832+/- 0.002 ml/g, and in the salt
solution it is  0.825+/-0.002 ml/g. There was no concentration dependence to
either value over the range from 5-16 m/ml (in water) and 5-25 mg/ml in the
salt solution. The value in water is within 1% of that reported by
Vennemann, Lechner and Oberthur (Polymer, 28:1738-1747, 1987). The latter
study, I believe, looked at different-sized PEG and found that the vbar is
relatively insensitive to size.
Best wishes,
Tom

University of New Hampshire
Rudman 379
Durham, NH 03824-3544
Phone: 603-862-2459
FAX:    603-862-4013

 -----Original Message-----
From: 	Neil Errington [neil.errington@nottingham.ac.uk]">mailto:neil.errington@nottingham.ac.uk]
Sent:	Thursday, January 25, 2001 10:38 AM
To:	rasmb@bbri.org
Subject:	vbar of PEG

Dear ALL

Does anyone out there have any values (or can point me at some) for the vbar
of PEG. I have a system which is conjugated to PEG2000 to approx. 15% by
weight and some vbar info would be useful for the AUC study. There isn't
enough of the conjugate to measure vbar unfortunately.

Thanks in advance for any help

Hope you're all having a Happy New Year so far.

Neil Errington