Abstract
A highly sensitive method for brief and economical staining of proteins in 1-D and 2-D sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) by 4′,5′-Dibromofluorescein (DBF) was developed in this study. Down to 0.025–0.05ng protein could be detected within 10min (only 2 steps) by DBF stain, which is approximately 10-fold more sensitive than those of Eosin Y (EY) and SYPRO Ruby stains, and 20-fold more sensitive than that of imidazole-zinc (IZ) negative stain. In addition, the LC-MS/MS results indicated that the newly developed staining method is compatible with the downstream protein identification. Moreover, the mechanism of DBF stain was investigated by molecular docking.
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