Polydopamine-Antibiotic Composite Coating for Antibiofilm Applications

Area of Science:

• Biomaterials Science
• Infectious Diseases
• Polymer Chemistry

Background:

• Urinary catheterization affects 15-25% of hospitalized patients.
• Catheter-associated infections are often caused by biofilm-forming Gram-negative bacteria.
• Current solutions for preventing these infections are limited.

Purpose of the Study:

• To develop and evaluate a novel polymer-based antimicrobial coating for urinary catheters.
• To assess the antibiofilm efficacy of a polydopamine-gentamicin (PD-Gent) coating against Pseudomonas aeruginosa.
• To determine the coating's versatility across different substrates and antimicrobial agents.

Main Methods:

• A polymer coating (polydopamine) was embedded with gentamicin (PD-Gent).
• The antibiofilm efficacy of PD-Gent was tested against Pseudomonas aeruginosa (PAO1) on various substrates.
• PD-Gent coated silicone Foley catheters were challenged with PAO1 in artificial urine under continuous flow.

Main Results:

• The PD-Gent coating significantly reduced PAO1 biofilm formation compared to uncoated controls.
• The coating demonstrated consistent antibiofilm activity on polystyrene, PVC, and silicone.
• PD-Gent coated Foley catheters inhibited biofilm formation by three-fold under continuous flow conditions.

Conclusions:

• The PD-Gent coating is a promising strategy for reducing catheter-associated infections.
• The coating is versatile, adaptable to different substrates and antibiotics.
• This technology has strong potential for clinical application in preventing biofilm-related complications.