Multifunctional dopamine modification of green antibacterial hemostatic sponge

A novel hemostatic nanocomposite (OBC-PDA/PDA-MMT/Ag NPs) was prepared. As Functional hemostatic particles, hydrochloric acid modified montmorillonite coated with dopamine (PDA-MMT) doped into oxidized bacterial cellulose (OBC). In the presence of carboxyl and dopamine, silver ions (Ag⁺) were reduced into Ag nanoparticles (Ag NPs) distributed homogeneously on the matrix of PDA-MMT and OBC. Then, dopamine was grafted onto the oxidized bacterial cellulose under the crosslinking effect of 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide (EDC). After dopamine was grafted onto the oxidized bacterial cellulose, the interaction between PDA-MMT and the whole material was enhanced, and the flexibility was also improved. OBC-PDA/PDA-MMT/Ag NPs hemostatic sponge have appropriate mechanical strength, broad-spectrum antibacterial properties and excellent biodegradability. The hemostatic sponge with addition of PDA-MMT and Ag NPs is expected to provide functional properties such as rapid hemostasis, bacteriostasis and wound healing. In addition, the hemostatic effect of the compound was confirmed in vivo. The hemostatic sponge showed greater coagulation capacity, higher adherent red blood cells and platelets, and lower blood loss. The results show that hemostatic sponge is a rapid and effective coagulant with good antibacterial properties.