Salt-Responsive Switchable Block Copolymer Brushes with Antibacterial and Antifouling Properties.

Area of Science:

• Materials Science
• Biomedical Engineering
• Polymer Chemistry

Background:

• Biomedical device-associated infections are a significant clinical challenge.
• Current implant coatings often lack multifunctionality and long-term efficacy.
• Developing robust, antifouling, and antibacterial surfaces is crucial for improving patient outcomes.

Purpose of the Study:

• To engineer multifunctional biosurfaces with combined antifouling and antibacterial properties.
• To utilize multiblock copolymers and the antipolyelectrolyte effect for surface modification.
• To create regenerable coatings for titanium oxide surfaces.

Main Methods:

• Synthesis of multiblock copolymers via RAFT polymerization.
• Modification of block copolymers to create polyzwitterionic/antifouling and polycationic/antibacterial blocks.
• Attachment of copolymers to titanium oxide surfaces.
• Evaluation of antifouling properties using protein adsorption assays (pepsin).
• Assessment of antibacterial activity against Staphylococcus aureus and Escherichia coli.

Main Results:

• Successfully synthesized multiblock copolymers with controlled architectures.
• Demonstrated effective antifouling properties against model proteins.
• Achieved surface regeneration through a simple salt washing step.
• Confirmed significant antibacterial activity via contact killing.
• Coated titanium substrates showed promising results in preliminary microbiological assays.

Conclusions:

• The developed strategy provides a versatile platform for creating multifunctional biosurfaces.
• These coatings exhibit promising antifouling, regenerable, and antibacterial characteristics.
• This approach holds potential for developing long-term effective antibacterial implant coatings to combat device-associated infections.