Staining of proteins in PhastGel gradient media with Coomassie Blue R 350 was considerably improved using a lower concentration of methanol (10% v/v) and 2% ammonium sulfate in the staining solution and 10% acetic acid for destaining. The detection limit in sodium dodecyl sulfate-polyacrylamide gels was lowered by a factor of 10 to about 2 ng per protein band. The Coomassie staining method was adapted to the newly developed silver staining procedure so that both can be used in parallel in PhastSystem.
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Heukeshoven et al. (1988) studied this question.
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