SOB Medium was developed by Hanahan as a nutritionally rich growth medium for preparation and transformation of competent cells. Growth of E. coli in SOB medium results in higher transformation efficiencies of plasmids.

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.