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Sodium dodecyl sulfate (SDS)-linear polyacrylamide solution-filled capillary electrophoresis using a stable coated fused silica capillary has been developed for the separation and molecular weight determination of proteins. A fused silica capillary was coated with linear polyacrylamide through Si-C bond which suppressed the electro-osmotic flow and reduced the adsorption of proteins. Acrylamide solution containing SDS was filled into the coated capillary and polymerized. Compared with a conventional fused silica capillary coated with 3-methacryloxypropyltrimethoxysilane through siloxane linkage (Si-O-Si-C), the developed capillary was much more stable, even in the alkaline condition. Consequently, the durability of the polymer matrices and the reproducibility of separation were markedly improved. An excellent linear relationship was obtained between the mobility and the logarithm of the protein molecular weight. The relative standard deviation of migration times was below 1%.

Sodium Dodecyl Sulfate-Polyacrylamide Solution-Filled Capillary Electrophoresis of Proteins Using Stable Linear Polyacrylamide-Coated Capillary.