MAL-PEG-MAL is widely used in bioconjugation and drug delivery systems due to its ability to link molecules through its maleimide groups. It is particularly effective in attaching peptides, proteins, or antibodies to other biomolecules or nanoparticles, enhancing targeted delivery in therapeutic applications. The PEG (polyethylene glycol) spacer improves solubility, reduces immunogenicity, and increases circulation time in the body, making it valuable in developing cancer therapies, vaccines, and diagnostic agents. Additionally, it is utilized in surface modification of materials for biomedical devices, ensuring better biocompatibility and performance.