Networked Zwitterionic Durable Antibacterial Surfaces.

Area of Science:

• Materials Science
• Biotechnology
• Surface Chemistry

Background:

• Conventional bactericidal and contact-killing surfaces have limitations for practical use.
• Zwitterionic polymers offer excellent nonfouling properties but often lack durability.
• Existing durable zwitterionic surfaces are typically made using atom transfer radical polymerization (ATRP), limiting widespread application.

Purpose of the Study:

• To develop durable zwitterionic polymer surfaces with enhanced mechanical and chemical resistance for long-term antibacterial applications.
• To overcome the durability limitations of current zwitterionic nonfouling surfaces.
• To create a new paradigm for designing robust antibacterial surfaces.

Main Methods:

• Simple blending of poly(sulfobetaine methacrylate) (PSBMA)/poly(ether sulfone) (PES) semi-interpenetrated networked microgels with a hydrophobic PES polymer matrix.
• Surface preparation to induce hydration layers and resist nonspecific protein adsorption.
• Evaluation of bacterial adhesion for Escherichia coli and Staphylococcus aureus under static and flow conditions.

Main Results:

• The developed zwitterionic polymer surfaces demonstrated significant resistance to bacterial attachment.
• Efficient induction of hydration layers was observed, contributing to the nonfouling properties.
• The surfaces showed reduced nonspecific protein adsorption, a key factor in preventing bacterial adhesion.

Conclusions:

• The study successfully created durable zwitterionic polymer surfaces with effective long-term antibacterial properties.
• The novel blending approach overcomes the durability issues associated with previous zwitterionic polymer surface fabrication methods.
• These findings establish a new strategy for developing robust, nonfouling antibacterial surfaces for various applications.