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From: Borries Demeler <demeler@bioc02.uthscsa.edu>
To : rasmb@bbri.harvard.edu
Date: Wed, 3 Jun 1998 07:34:24 -0500 (CDT)
Hepes and Pipes buffer values
Dear RASMB'ers,
I am looking for buffer data (density and viscosity) for pipes and hepes
buffer for inclusion into the sednterp database. Does anybody have the
values or measured these over a useful concentration range?
The appropriate polymomial fit coefficients would work also. Thanks!
-Borries
*******************************************************************************
Borries Demeler
The University of Texas Health Science Center at San Antonio
Dept. of Biochemistry
7703 Floyd Curl Drive
San Antonio, Texas 78284-7760
Voice: (210) 567-6592
Fax: (210) 567-4575
Email: demeler@biochem.uthscsa.edu
*******************************************************************************
From jcorreia@fiona.umsmed.edu Wed Jun 3 10:28:13 1998
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Date: Wed, 03 Jun 1998 10:33:51 -0500
To: Borries Demeler <demeler@bioc02.uthscsa.edu>
From: jack correia <jcorreia@fiona.umsmed.edu>
Subject: Re: Hepes and Pipes buffer values
In-Reply-To: <199806031234.HAA16462@bioc02.uthscsa.edu>
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Status: RO
-Borries
We have done Pipes from 10 to 400 mM complete with fits etc at 25oC.
However, we then did temperature work (4-37oC) at 10 and 100 mM and
compared it the changes in water. The deviations are, not surprizingy,
large and get larger at higher concentrations. Thus we plan to investiagte
it in a systematic way and come up with a better set of data that takes
into account effects of [Pipes] on density and its temperature dependence.
Then we planned to hand the data over to Tom for a different incorporation
into sednterp. We also have done EGTA and MgSO4 since we use commonly use
them in our buffers, but the same problem must be dealt with. I am willing
to put the data and fits out there before we solve the problem since the
rest of the data set is done in the same way, but we did it at 25, not 20,
so incorporation immediately introduces error.
This means the entire density (& viscosity) data set incorrectly corrects
for temp. Our solution for density is to measure the actual buffer at the
experimental temperature since we have a new Anton Paar with a 0-80oC
range. Viscosity is another question since it takes much longer to do and
its not so easy to vary temperature baths over that range for a viscosity
measurement. I suspect therefore we will only do density.
--------------------------------------------------------
Dr. John J. "Jack" Correia
Department of Biochemistry
University of Mississippi Medical Center
2500 North State St.
Jackson, MS 39126
(601) 984-1522
fax (601) 984-1501
email: jcorreia@fiona.umsmed.edu
homepage: http://fiona.umsmed.edu/~biochem/correia.html
---------------------------------------------------------
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