Download Homogeneous Buffer Systems

Homogeneous Buffer Systems
In a homogeneous buffer system, the identity and concentration of buffer components are the same in the gel
and the tanks. Most forms of DNA and RNA electrophoresis generally use homogeneous buffer systems.
Electrophoresis of proteins is most often performed under multiphasic conditions, where tank and gel
buffers differ.
In a homogeneous system the buffer performs the functions of protecting the samples and carrying the
current. Problems most often arise with homogeneous systems if the ionic strength is for some reason
different in the gel versus either of the tanks. Most often this occurs due to the inadvertent omission of a
component, a mistake in stoichiometric calculations, or precipitation in a stock solution (10X TBE is
especially prone to this problem). One consequence of a concentration gradient between the tank and the gel,
is a "salt wave" which migrates through the gel during electrophoresis. Accompanying this concentration
gradient will be changes in the electrical parameters leading to localized distortions in the band pattern.
NEXT TOPIC: Multiphasic Buffer Systems
Products Related to this Discussion:
TAE Buffer (50X)
Manufactured with ultra-pure reagents, 18 megOhm water, and 0.2 micron filtration.
TBE Buffer (10X)
Formulated with 18MegOhm water. 0.2 micron filtration. The most stable TBE on the market.