Abstract
An optimized Coomassie staining procedure, utilizing Coomassie Brilliant Blue G-250 in phosphoric acid/ammonium sulfate, was applied to ultrathin-layer isoelectric focusing in 0.18 mm polyacrylamide gels, and sodium dodecyl sulfate-polyacrylamide gel electrophoresis in 0.38 mm polyacrylamide gels, both backed to Gel-Fix polyester supporting films. After isoelectric focusing staining of gelatin and acidic proteins was better with the phosphoric acid/ammonium sulfate procedure than with conventional organic solvent methods. When applied to gels after sodium dodecyl sulfate-polyacrylamide gel electrophoresis the sensitivity of the phosphoric acid/ammonium sulfate method was equal to that on conventional staining but lower than on silver staining.
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