A highly efficient bactericidal surface based on the co-capture function and photodynamic sterilization.

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Bacterial infections pose a significant threat to human health.
• Developing effective antibacterial surfaces is crucial for preventing infections.
• Existing materials often lack efficient methods for both bacterial capture and killing.

Purpose of the Study:

• To synthesize a novel nano-topographic material surface for bacterial capture and killing.
• To evaluate the antibacterial efficiency of the developed material against Gram-negative bacteria.
• To explore potential applications in bacterial enrichment and clinical settings.

Main Methods:

• Synthesis of silicon nanowire (SiNW) arrays modified with protoporphyrin IX (ppix) and β-CD-mannose7 (CDm).
• Evaluation of bacterial capture using the combined function of SiNW topography and CDm.
• Assessment of bactericidal efficiency via 630 nm light irradiation and reactive oxygen species (ROS) generation.
• Microscopic analysis (fluorescence and SEM) to confirm bacterial killing and cell wall damage.

Main Results:

• The synthesized SiNW-p-ppix@CDm surface demonstrated highly efficient bacterial capture.
• A 96.7% killing efficiency was achieved against Escherichia coli (E. coli) after light irradiation.
• Scanning electron microscopy confirmed bacterial cell wall lysis due to ROS.

Conclusions:

• The developed nano-engineered surface effectively captures and eliminates bacteria.
• This material shows promise for applications in water quality monitoring and clinical antibacterial materials.
• The combination of nanostructure and photosensitizers offers a potent strategy for combating bacterial infections.