Avidin is a tetrameric protein commonly isolated from egg whites. Avidin binds to biotin with strength approaching that of a covalent bond. Disruption of the avidin-biotin bond occurs only under extraordinary conditions, such as pH 1.5 with 6 M guanidium hydrocholoride. Fluorescent avidin can bind to biotinylated antibodies used in immunohistochemistry and immunocytochemistry. Avidin thiol can bind to gold surfaces and act as a glue for biotinylated proteins. Avidin agarose is useful for efficient removal of biotinylated proteins from a liquid phase.
Streptavidin is similar to avidin in that it binds biotin and exists as a tetramer. Streptavidin’s primary advantage is that it less charged under neutral conditions and is therefore less likely to be involved in unwanted ionic interactions.
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Streptavidin azide
$199.10 – $579.00 Select options -
Neutravidin thiol
$247.50 – $464.20 Select options -
Streptavidin (without modification)
$52.80 – $161.70 Select options -
Streptavidin CY5.5
$82.50 – $161.70 Select options -
Streptavidin CY5
$82.50 – $161.70 Select options -
Streptavidin CY3
$82.50 – $161.70 Select options -
Streptavidin TRITC
$82.50 – $156.20 Select options -
Streptavidin-fluorescein (FITC)
$49.00 – $105.00 Select options -
Streptavidin thiol
$199.10 – $776.60 Select options -
Avidin CY3
$88.00 – $187.00 Select options -
Avidin CY5
$88.00 – $187.00 Select options -
Avidin (without modification)
$25.30 – $327.80 Select options -
Avidin Sepharose
$66.00 – $379.50 Select options -
Avidin thiol
$88.00 – $819.50 Select options -
Avidin CY5.5
$88.00 – $434.50 Select options -
Avidin-fluorescein
$55.00 – $550.00 Select options
