E2511 Sigma


essentially salt-free, lyophilized powder



Related Categories Antibodies, Avidin / Biotin Reagents, Biotin/Avidin, ExtrAvidin Reagents, Molecular Biology,
form   essentially salt-free, lyophilized powder
application(s)   dot blot: suitable
  immunohistochemistry: suitable
  indirect ELISA: suitable
  radioimmunoassay: suitable
shipped in   wet ice
storage temp.   2-8°C


Other Notes

A modified form of affinity purified egg white avidin.


Binding Activity: at least 10 μg biotin per mg


ExtrAvidin® may be used in conjunction with biotin in techniques such as ELISA, RIA, immunohistochemistry, protein blotting, and with DNA probes. It was used to capture biotinylated RNA in a study to understand translation initiation pathway using immobilised mRNA analogues. It was used to bind to biotinylated surface during preparation of substrates for protein assembly.

Biochem/physiol Actions

ExtrAvidin® is prepared from egg white avidin. It is a tetrameric protein containing four high affinity binding sites for biotin. It combines the high specific activity of avidin with the low background staining of streptavidin, a biotin binding protein produced by the bacteria Streptomyces avidinii. It binds biotin with the high affinity of egg white avidin, however, it does not exhibit the unwanted non-specific binding reported for egg white avidin at physiological pH, such as the staining of mast cells.

Legal Information

ExtrAvidin is a registered trademark of Sigma-Aldrich Co. LLC

Price and Availability

Amplified Detection
Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis

Certificate of Origin

Protocols & Articles


Antibody Basics

Immunoglobulins (Igs) are produced by B lymphocytes and secreted into plasma. The Ig molecule in monomeric form is a glycoprotein with a molecular weight of approximately 150 kDa that is shaped more ...
Keywords: Affinity chromatography, Centrifugation, Chromatography, Digestions, Direct immunofluorescence, Gene expression, High performance liquid chromatography, Immunofluorescence, Ion Exchange, Microscopy, Precipitation, Purification, Rheumatology, Scanning electron microscopy

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