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Protein Protocols Protein Protocols

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362 Haugland and You<br />

ing with one antibody molecule. Because biotin, biotin-X, and biotin-XX are very<br />

hydrophobic molecules, a high degree of biotinylation might increase the background or<br />

might destabilize the antibody. To obtain a degree of biotinylation of about 3–7 biotins/<br />

IgG, generally a molar ratio of 15 mol of amino biotinylating reagent/mol of protein is<br />

used. When the concentration of the antibody is

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