Biotin-PEG-OH, MW 5,000 is a PEG polymer with a terminal hydroxyl for biotinylation. Biotin can strongly bind to avidin or streptavidin. The Avidin-biotin complex is the strongest known non-covalent interaction (Kd = 10-15M) between a protein and ligand. The hydroxyl group can further derivatize the compound. Reagent grade, for research purpose.
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