STABILITY of solubilization buffer

Hiranya Roychowdhury hroychow at NMSU.EDU
Fri Jan 16 15:30:10 EST 1998

At 04:35 PM 1/16/98 GMT, Rocky Baker wrote:
>What is the stability of a protein solubilization solution containing 
>Tris-Hcl, 4% SDS, 20% glycerol, and 10% 2-mercaptoethanol?
>Is this something I can prepare and store at room temp or 4 C until used 
>or does it need to be made fresh?
>bakerroc at

Also known as the "Laemmli Sample Buffer" (pH6.8), it is stored at RT for
obvious reasons. However, unless the vessel is sealed properly, the
mercaptoethanol evaporates off to a large extent over time and the buffer
may need to be "spiked" with the same before use. Properly stored, it should
last a few months or longer. There is no need to make it up fresh. However,
since one needs very little each time, usually not a whole lot is made up at
a time. Reconstituting this buffer from stock solutions of 0.5M Tris.Cl,
pH6.8, 20%/10% SDS, glycerol and ME involves little effort if and when needed.

Dr. Hiranya Sankar Roychowdhury
Plant Genetic Engineering Lab.
New Mexico State University
Las Cruces, NM 88003
Ph. (505) 646-5785
hroychow at

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