Biotin-PEG2-hydrazide is a biotinylation reagent that can be used to label glycoproteins, carbohydrate-bearing compounds that have oxidizable sugars, or aldehydes. Hydrazine moiety reacts with an aldehyde to form semi-permanent hydrazone bonds. The hydrophilic PEG arm imparts water solubility that is transferred to the biotinylated entity.
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