m-PEG11-acid is widely used in bioconjugation and drug delivery systems due to its ability to enhance solubility, stability, and bioavailability of therapeutic compounds. It is often employed to modify proteins, peptides, and small molecules, reducing immunogenicity and prolonging circulation time in the body. In pharmaceutical formulations, it serves as a linker for attaching targeting ligands or drugs, improving their efficacy and specificity. Additionally, it is utilized in the development of hydrogels and biomaterials for controlled release applications. Its hydrophilic PEG chain also makes it valuable in surface modification to create non-fouling coatings for medical devices and implants.