Development of photoactive biomaterial using modified fullerene nanoparticles

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Medical Microbiology

Background:

• Medical device-associated biofilm infections are a major public health concern.
• Current antimicrobial strategies for these infections are often ineffective.
• Antimicrobial photodynamic therapy (aPDT) presents a promising alternative.

Purpose of the Study:

• To modify polylactic acid (PLA) surfaces with fullerene (C60) for enhanced antimicrobial properties.
• To investigate the effect of fullerene modification on surface characteristics and bacterial adhesion.
• To evaluate the potential of fullerene-based biopolymers in aPDT applications.

Main Methods:

• Surface modification of PLA with ethylenediamine (EDA) followed by C60 precipitation.
• Characterization using X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), scanning electron microscopy (SEM), and water contact angle measurements.
• Assessment of bacterial attachment propensity based on surface hydrophobicity and roughness.

Main Results:

• XPS confirmed successful C60 modification, with highest carbon increase after EDA pre-treatment.
• Fullerene precipitation increased surface hydrophobicity, potentially reducing bacterial adhesion.
• Surface roughness was altered by modification, becoming smoother with lower C60 concentrations.

Conclusions:

• Fullerene-modified PLA surfaces demonstrate potential for developing antimicrobial medical devices.
• The modified surfaces may enhance the efficacy of antimicrobial photodynamic therapy.
• Further research into fullerene-based biopolymers for aPDT is warranted.