NH2-PEG-NH2 is widely used in bioconjugation and drug delivery systems due to its bifunctional nature. It serves as a linker to attach therapeutic agents, such as drugs or proteins, to other molecules or surfaces, enhancing solubility and stability. In nanotechnology, it is employed to modify nanoparticles, improving their biocompatibility and reducing immune system recognition. It is also utilized in tissue engineering to functionalize scaffolds, promoting cell adhesion and growth. Additionally, NH2-PEG-NH2 plays a role in diagnostic applications, where it is used to label biomolecules for imaging or detection purposes. Its versatility makes it a valuable tool in biomedical research and therapeutic development.