Propargyl-PEG-OH

The Propargyl-PEGn-OH series, exemplified by Propyne-PEG24-OH, is a heterobifunctional PEG derivative featuring a hydroxyl group and a terminal alkyne (propyne) group. This structure enables versatile conjugation through copper-catalyzed azide-alkyne cycloaddition (CuAAC) while maintaining a bioorthogonal handle for biomolecular modification. Its key advantages include flexible orthogonal reactivity, tunable PEG length (n), and enhanced solubility for hydrophobic compounds. The terminal alkyne group allows efficient “click” conjugation with azide-functionalized molecules, though copper catalysts may require optimization to minimize cytotoxicity in biological applications.