Azido-PEG35-amine is widely used in bioconjugation and chemical biology due to its azide functional group, which enables efficient click chemistry reactions. It serves as a linker in the synthesis of peptide and protein conjugates, enhancing solubility and stability in aqueous environments. This compound is instrumental in drug delivery systems, where it facilitates the attachment of therapeutic agents to targeting molecules, improving their bioavailability and specificity. Additionally, it is employed in the development of hydrogels and biomaterials for tissue engineering, providing a versatile platform for cross-linking and functionalization. Its PEG spacer also reduces immunogenicity, making it suitable for biomedical applications.