Dual-Function Antibacterial Micelle via Self-Assembling Block Copolymers with Various Antibacterial Nanoparticles

Area of Science:

• Biomaterials Science
• Nanotechnology
• Infectious Disease Research

Background:

• Biomaterial-centered infections pose a significant clinical challenge.
• Developing materials with both antibacterial and anti-resistance properties is crucial.
• Existing antibacterial agents can lead to microbial resistance.

Purpose of the Study:

• To construct dual-function antibacterial biomaterials combining bactericidal nanoparticles with antifouling block copolymers.
• To investigate the self-assembly behavior and antibacterial efficacy of these nanocomposites.
• To evaluate the cell compatibility and long-term antibacterial activity of the developed materials.

Main Methods:

• Synthesis of ZnO or Ag-ZnO nanoparticles (NPs) and triblock copolymers (PEG-PHBV-PEG).
• Formation of nanocomposite aggregations through self-assembly.
• Assessment of NP release kinetics and long-term antibacterial activity in deionized water.
• Evaluation of cell compatibility using ATDC5 cells and antibacterial efficacy against Escherichia coli and Staphylococcus aureus.

Main Results:

• Nanocomposite aggregations with long PEG segments exhibited enhanced bacterial resistance and bactericidal activity.
• The materials demonstrated high sterilization rates (>91% for E. coli, >98% for S. aureus) at concentrations below 50 μg/mL.
• The nanocomposites showed good cell compatibility with ATDC5 cells.
• Long PEG aggregation demonstrated greater cell proliferation capacity compared to short PEG aggregation.

Conclusions:

• Flexible self-assembling antibacterial NPs with antifouling block copolymers offer a promising strategy for dual-function antibacterial materials.
• Adjusting component ratios and segment lengths can optimize material performance.
• These materials show potential for reducing the incidence of biomaterial-centered infections.