Tween-20 is a non-ionic surfactant that is useful for solubilizing membrane proteins during isolation. Tween-20 is also added to buffers for immunohistochemistry. Tween-20 may also help to prevent non-specific antibody binding and function as a blocking agent in immunoblotting assays. It has been used in preextraction of membranes to remove peripheral proteins.

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.