Salt-Induced Regenerative Surface for Bacteria Killing and Release.

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomedical Engineering

Background:

• Antibacterial surfaces are crucial for preventing infections in medical settings, especially for reusable devices.
• Existing antibacterial surfaces often require complex fabrication or harsh stimuli, limiting their practical use.
• There is a need for simple, efficient, and reusable antibacterial surfaces with controlled bacteria killing and release capabilities.

Purpose of the Study:

• To develop a simple, salt-responsive polyzwitterionic brush surface with integrated bacteria killing and release functions.
• To functionalize the polyzwitterionic brush with an effective bactericide, triclosan (TCS).
• To evaluate the efficiency, reusability, and long-term stability of the developed antibacterial surface.

Main Methods:

• Grafting triclosan (TCS) onto a salt-responsive polyzwitterionic brush, poly(3-(dimethyl (4-vinylbenzyl) ammonium) propyl sulfonate) (polyDVBAPS).
• Assessing bacteria killing efficiency by quantifying attached bacteria.
• Evaluating bacteria release by shaking the surface in 1.0 M NaCl solution.
• Testing the reusability and stability of the surface over multiple killing and release cycles.

Main Results:

• The functionalized surface demonstrated high bacteria killing efficiency (>95%).
• The surface rapidly detached approximately 97% of bacteria after gentle shaking in 1.0 M NaCl.
• The killing and release efficiencies remained unchanged after four severe killing/release cycles, indicating excellent reusability and durability.
• The polyDVBAPS-TCS surface successfully integrated bacteria attachment/release and bactericidal functions.

Conclusions:

• A simple and effective salt-responsive polyzwitterionic brush surface for antibacterial applications was successfully developed.
• The developed surface exhibits efficient bacteria killing, rapid release, and remarkable reusability, addressing limitations of current technologies.
• This work contributes novel zwitterionic polymer functionalities and provides a promising platform for reusable antibacterial strategies in biological and biomedical fields.