Bromophenol Blue sodium salt is used as a tracking dye for protein and nucleic acid electrophoresis in polyacrylamide gels. It also used in the preparation of protein samples for western blotting analysis. It finds application in staining histones.

This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Scientific Chemicals.