m-PEG7-azide is widely used in bioconjugation and click chemistry applications. It serves as a linker to attach biomolecules, such as proteins, peptides, or antibodies, to other functional groups or surfaces. Its azide group enables efficient and selective reactions with alkyne-containing compounds through copper-catalyzed azide-alkyne cycloaddition (CuAAC), a key process in click chemistry. This makes it valuable in drug delivery systems, where it helps create targeted therapies by linking drugs to carriers. Additionally, it is utilized in surface modification, enabling the functionalization of nanoparticles or materials for biomedical research. Its PEG (polyethylene glycol) chain enhances solubility and reduces immunogenicity, making it suitable for in vivo applications.