mPEG-EO is widely used in the pharmaceutical and biotechnology industries for drug delivery systems. It is commonly employed to modify proteins, peptides, and other therapeutic molecules to enhance their solubility, stability, and circulation time in the body. This modification helps reduce immunogenicity and prevents rapid clearance by the immune system, making it particularly valuable in the development of long-acting injectable drugs. Additionally, mPEG-EO is utilized in the creation of hydrogels and biocompatible coatings for medical devices, improving their performance and reducing the risk of adverse reactions in patients. Its versatility also extends to research applications, where it is used as a linker or spacer in bioconjugation techniques.