Amino-PEG9-alcohol is widely used in bioconjugation and chemical modifications due to its reactive amino group and hydrophilic polyethylene glycol (PEG) chain. It serves as a linker in drug delivery systems, enhancing the solubility and stability of therapeutic compounds. The PEG chain reduces immunogenicity and prolongs circulation time in the body, making it valuable in the development of PEGylated drugs. Additionally, it is utilized in the synthesis of peptide and protein conjugates, improving their pharmacokinetic properties. In material science, it is employed to modify surfaces, creating biocompatible coatings for medical devices. Its applications also extend to nanotechnology, where it is used to functionalize nanoparticles for targeted drug delivery and imaging.