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Avidin and Streptavidin Reagents

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
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    Streptavidin-Oregon Green

    $99.00$289.00
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    Neutravidin thiol

    $247.50$464.20
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    Streptavidin (without modification)

    $52.80$161.70
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    Streptavidin CY5.5

    $82.50$161.70
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    Streptavidin CY5

    $82.50$161.70
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    Streptavidin CY3

    $82.50$161.70
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    Streptavidin TRITC

    $82.50$156.20
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    Streptavidin-fluorescein (FITC)

    $49.00$105.00
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    Streptavidin thiol

    $199.10$776.60
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    Avidin CY3

    $88.00$187.00
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    Avidin CY5

    $88.00$187.00
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    Avidin (without modification)

    $25.30$327.80
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    Avidin Sepharose

    $66.00$379.50
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    Avidin thiol

    $88.00$819.50
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    Avidin CY5.5

    $88.00$434.50
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