BSA blocking buffer have a high affinity for proteins. A variety of blocking buffers ranging from milk or normal serum to highly purified proteins have been used to block free sites on a membrane. It is a good blocking agent that is easily prepared in the lab. It can be used in a range from 0.3% to 5%. It is also useful for saturating excess protein-binding sites on the membranes and microplates in immunoassays.

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.