Photodynamic antimicrobial polymers for infection control.

Area of Science:

• Materials Science
• Biomedical Engineering
• Infectious Disease Control

Background:

• Hospital-acquired infections (HAIs) are a significant patient risk and economic burden.
• Emergence of multidrug-resistant and biocide-tolerant bacteria complicates infection control.
• Inanimate surfaces act as reservoirs for pathogens, necessitating difficult disinfection procedures.

Purpose of the Study:

• To develop novel antimicrobial materials with inherent photodynamic and persistent properties.
• To prevent bacterial adherence and eliminate surfaces as reservoirs for nosocomial pathogens.
• To create a versatile material system for advanced infection control applications.

Main Methods:

• Incorporation of photosensitizers into high-density polyethylene (HDPE) via hot-melt extrusion.
• Fabrication of single-layer and two-layer material systems.
• Evaluation of antimicrobial efficacy against methicillin-resistant Staphylococcus aureus (MRSA) and Escherichia coli.

Main Results:

• Materials demonstrated inherent photodynamic, surface-active, and persistent antimicrobial properties.
• Significant reduction in viable bacterial adherence: up to 3.62 Log CFU/cm² for MRSA and 1.51 Log CFU/cm² for E. coli.
• Successful demonstration of a versatile two-layer material system.

Conclusions:

• Photosensitizer-incorporated HDPE offers a novel approach to combatting HAIs.
• The materials require only visible light for activation, simplifying intervention.
• Potential applications include antimicrobial coatings and materials for various healthcare settings, reducing pathogen reservoirs.