Mussel-inspired synthesis of magnetic N-Halamine nanoparticles for antibacterial recycling

Antibacterial N-halamine coatings are successful in avoiding and eliminating bacterial infections caused by bacterial contamination and biofilms on the surfaces. However, the N-halamine coatings remain a long-standing challenge faced by our healthcare system. Herein we reported a new mussel-inspired surface modification strategy to achieve N-halamine copolymer coatings with adhesive effects. The phenolic hydroxyl groups from Nhalamine copolymers are used for ligand exchange with oleic acid on the magnetic Fe3O4 nanoparticles for binding the N-halamine copolymer onto the surface of the nanoparticles. The as-synthesized N-halamine coatings endow the magnetic Fe3O4 nanoparticles antibacterial activity toward both Gram-negative bacteria (Escherichia coli) and Gram-positive bacteria (Staphylococcus aureus). Since the super-paramagnetism of Fe3O4 in core, the N-halamine coatings are separable magnetically and remain high inactivating efficiency toward bacteria even after five cycles. We believe that, with the advantage of mussel-inspired strategy, the N-halamine coatings should have great potential for use in antibacterial and biomedical fields.