pH responsive zwitterionic-to-cationic transition for safe self-defensive antibacterial application.

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Antimicrobial Technology

Background:

• Bacteria-induced infections are a significant challenge associated with medical devices.
• Developing intelligent antimicrobial surfaces is crucial for preventing device-related infections.

Purpose of the Study:

• To construct a novel zwitterionic surface with biocompatibility and anti-adhesion properties.
• To engineer a pH-responsive antimicrobial surface that transitions to a bactericidal state.
• To explore new strategies for safe and efficient application of cationic bactericides.

Main Methods:

• Fabrication of a zwitterionic surface.
• Evaluation of surface biocompatibility under physiological conditions.
• Assessment of anti-adhesion properties against initial bacterial colonization.
• Investigation of pH-responsive transition to a cationic bactericidal surface.
• Confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM) for antibacterial activity analysis.

Main Results:

• The zwitterionic surface demonstrated good biocompatibility and effectively inhibited initial bacterial adhesion.
• Bacterial proliferation triggered an acidic environment, causing surface amide bond cleavage.
• The surface rapidly converted to a cationic bactericidal state in response to pH changes.
• CLSM and SEM confirmed efficient antibacterial activity and anti-adhesion properties.
• The pH-responsive transition to quaternary ammonium compounds enhanced germicidal efficacy.

Conclusions:

• The pH-responsive zwitterionic-to-cationic transition antibacterial design offers a novel approach for medical materials.
• This strategy enables efficient and safe utilization of cationic bactericides in clinical settings.
• The developed surface provides a promising solution for combating medical device-associated infections.