• E2761
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buffered aqueous solution

MDL number:


FITC conjugate

Quality Level


buffered aqueous solution

extent of labeling

3-6 mol fluorochrome per mol protein


immunohistochemistry (formalin-fixed, paraffin-embedded sections): 20 μg/mL using human tissues
indirect immunofluorescence: 1:200

shipped in

dry ice

storage temp.


General description

Avidin is a tetrameric or dimeric biotin-binding protein produced in the oviducts of birds, reptiles and amphibians and deposited in the whites of their eggs. It consists of four high affinity binding sites for biotin. ExtrAvidin is prepared from egg white avidin. It is a modified form of affinity purified avidin and combines high specific activity of avidin with the low background staining of streptavidin. It is a biotin binding protein produced by the bacteria Streptomyces avidinii. ExtrAvidin has been conjugated to fluorescein isothiocyanate (FITC) and is used for various techniques.


ExtrAvidin®-FITC is suitable for the following applications:
  • immunohistochemistry (formalin-fixed, paraffin-embedded sections) at a concentration of 20μg/mL using human tissues.
  • Immunofluorescence
  • competitive binding assay


0.2, 1 mL

Physical form

Solution in 0.01 M phosphate buffered saline, containing 10% (v/v) 0.5 M carbonate buffer, pH 9.5, and 15 mM sodium azide

Preparation Note

Affinity purified protein

Legal Information

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


Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.

Storage Class Code

12 - Non Combustible Liquids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

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Certificate of Origin

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