NH2-PEG-NH2 is widely used in bioconjugation and drug delivery systems due to its bifunctional nature. It serves as a linker to connect biomolecules, such as proteins, peptides, or drugs, to other entities like nanoparticles or surfaces. Its PEG (polyethylene glycol) backbone provides excellent water solubility, reduces immunogenicity, and enhances stability of the conjugated products. In therapeutic applications, it is employed to modify drugs or proteins, prolonging their circulation time in the body and improving their efficacy. Additionally, it is utilized in the development of hydrogels and biomaterials for tissue engineering, where it acts as a crosslinking agent to create biocompatible and biodegradable scaffolds. Its amine groups also enable surface functionalization in nanotechnology, making it valuable for creating targeted delivery systems.