Methyl-PEG12-Azide is widely used in bioconjugation and click chemistry applications. It serves as a linker molecule, enabling the attachment of various biomolecules, such as proteins, peptides, or antibodies, to other functional groups or surfaces. Its azide group allows for efficient and specific reactions with alkyne-containing compounds via copper-catalyzed azide-alkyne cycloaddition (CuAAC). This property makes it valuable in drug delivery systems, where it helps in creating targeted therapeutic agents by conjugating drugs to carriers. Additionally, it is utilized in the development of biosensors and diagnostic tools, where it aids in immobilizing biomolecules onto sensor surfaces for enhanced detection capabilities. Its hydrophilic PEG chain improves solubility and biocompatibility, making it suitable for use in biological and pharmaceutical research.