Poly-γ-glutamate-based Materials for Multiple Infection Prophylaxis Possessing Versatile Coating Performance

Area of Science:

• Materials Science
• Biotechnology
• Surface Chemistry

Background:

• Poly-γ-glutamate (PGA) is a water-soluble biopolymer with unique structural properties.
• Developing effective and durable antimicrobial coatings remains a significant challenge in materials science.

Purpose of the Study:

• To synthesize and characterize water-insoluble poly-γ-glutamate ion-complexes (PGAICs).
• To evaluate the antimicrobial and antiviral efficacy of PGAICs as surface coatings.
• To investigate the stability and application potential of these novel coatings.

Main Methods:

• Synthesis of PGAICs using cationic surfactants (hexadecylpyridinium, dodecylpyridinium, benzalkonium, benzetonium).
• Structural analysis of synthesized PGAICs.
• Assessment of spontaneous coating performance on diverse materials (plastics, metals, ceramics).
• Antimicrobial testing against Staphylococcus aureus and Candida albicans.
• Antiviral testing against Influenza A and B viruses.
• Water-soaking treatment to evaluate coating stability.

Main Results:

• PGAICs demonstrated effective spontaneous coating on various material surfaces.
• PGAICs exhibited potent and durable anti-staphylococcal activity across different materials, even after water exposure.
• The PGA/hexadecylpyridinium (HDP) complex showed superior anti-fungal efficacy and coating stability against Candida albicans.
• PGA/HDP-coated surfaces achieved significant log reductions for Influenza A (5.4) and Influenza B (3.2) viruses.

Conclusions:

• Water-insoluble PGAICs can be effectively synthesized and applied as antimicrobial coatings.
• PGAICs offer a promising platform for developing durable, broad-spectrum antimicrobial surfaces.
• The PGA/HDP complex represents a novel and effective antiviral coating, marking the first observation of PGA-based antiviral coatings.