Abstract
Electrophoretic behavior of sodium dodecyl sulfate (SDS) in polyacrylamide gels has been examined at various gel concentrations. Micellar SDS is subject to significant molecular sieving from the gels while monomeric SDS is virtually free from the effect. The two forms are in a rapid equilibrium with each other. The gel concentration, therefore, has a signifieant effect on the electrophoresis of SDS added in SDS-polyacrylamide gel electrophoresis. The simplified procedure of Stoklosa and Latz (1974, Biochem. Biophys. Res. Commun. 58, 74–79), in which SDS is added only in sample solutions, has been criticized based on the results obtained.
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