Amino-PEG11-acid is widely used in bioconjugation and drug delivery systems due to its long polyethylene glycol (PEG) chain, which enhances solubility and reduces immunogenicity. It is commonly employed to modify proteins, peptides, and antibodies, improving their stability and circulation time in the body. In pharmaceutical research, it serves as a linker for attaching therapeutic agents to targeting molecules, enabling precise drug delivery to specific tissues or cells. Additionally, it is utilized in the development of diagnostic tools, where it helps in creating stable and efficient probes for imaging and detection. Its hydrophilic nature also makes it valuable in surface modification of nanoparticles, enhancing their biocompatibility and reducing aggregation.