Biotin-PEG-Alk (MW 600) is a Biotin-labeled Alkyne functionalized polyethylene glycol. Biotin-PEG-Alk (MW 600) can be used to modify proteins, peptides , and oligonucleotides. Biotin-PEG-Alk (MW 600) is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.