NH2-PEG-OH is widely used in bioconjugation and drug delivery systems due to its bifunctional properties. The amino group (NH2) allows for covalent attachment to various molecules, such as proteins, peptides, or drugs, while the hydroxyl group (OH) provides solubility and biocompatibility. It is commonly employed to modify surfaces, nanoparticles, or therapeutic agents to enhance their stability, reduce immunogenicity, and improve circulation time in the body. Additionally, it serves as a linker in the development of targeted therapies, enabling precise delivery of drugs to specific cells or tissues. Its versatility also extends to applications in tissue engineering, where it is used to functionalize scaffolds for improved cell adhesion and growth.