Inhibiting Bacterial Adhesion by Mechanically Modulated Microgel Coatings

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Microbiology

Background:

• Bacterial infections pose significant risks in biomedical applications.
• Developing effective anti-adhesion strategies is crucial for medical devices.

Purpose of the Study:

• To investigate poly-N-isopropylmethacrylamide (PNIPMAm) microgel coatings for preventing bacterial adhesion.
• To determine the influence of microgel properties (cross-linking density, size, coating thickness) on bacterial adhesion.

Main Methods:

• Microgel coatings were prepared using a cost-effective spraying approach.
• Bacterial adhesion of Staphylococcus aureus was quantified using a parallel plate flow chamber.
• Surface properties like cross-linking density and coating thickness were systematically varied.

Main Results:

• All microgel coatings achieved over 98% reduction in bacterial adhesion.
• Bacterial adhesion was reduced with lower cross-linking density and increased coating thickness.
• Optimal results were obtained with the thickest coating (602 nm) and lowest cross-linking density.

Conclusions:

• PNIPMAm microgel coatings offer a simple and effective method to prevent bacterial adhesion.
• Coating thickness and microgel stiffness are key parameters for fine-tuning anti-adhesion performance.
• These microgel coatings show promise for biomedical applications requiring bacterial resistance.