Used in bioconjugation to link therapeutic proteins, peptides, or drugs, enhancing their stability and circulation time in the body. Commonly applied in drug delivery systems where its multi-arm structure allows for higher loading capacity and controlled release. Serves as a crosslinker in hydrogel formation for tissue engineering and wound healing applications due to its biocompatibility and tunable physical properties. Also utilized in surface modification of medical devices to reduce protein adsorption and improve biocompatibility. Its carboxyl groups enable easy activation and coupling with amine-containing molecules, making it valuable in diagnostic assays and biosensor development.