Moth-eye mimetic cytocompatible bactericidal nanotopography: a convergent design

Area of Science:

• Biomaterials Science
• Nanotechnology
• Microbiology

Background:

• Antibiotic resistance necessitates novel strategies against bacterial infections.
• Bioinspired surface topographies offer a sustainable approach to combat pathogens.
• Medical implants require materials with both biocompatibility and antibacterial properties.

Purpose of the Study:

• To demonstrate the bactericidal activity and cytocompatibility of a moth-eye mimetic surface topography.
• To investigate the mechanism of bacterial cell death induced by the nanotopography.
• To assess the potential of this technology for medical implant applications.

Main Methods:

• Fabrication of moth-eye topography using thermal polymer nanoimprinting.
• Evaluation of bactericidal efficacy against Gram-negative and Gram-positive bacteria.
• Analysis of bacterial cell wall rupture via electron microscopy.
• Assessment of keratinocyte proliferation and morphology for cytocompatibility.

Main Results:

• The moth-eye topography exhibited significant bactericidal activity against both Gram-negative and Gram-positive bacteria.
• Electron microscopy confirmed bacterial cell wall rupture as the primary mechanism of bacterial death.
• Keratinocyte cultures showed normal proliferation and morphology, indicating excellent cytocompatibility.
• The nanotopography effectively deters bacterial adhesion and infection.

Conclusions:

• Moth-eye mimetic nanotopography is a viable strategy for developing antibacterial surfaces.
• This bioinspired surface offers a mechanically based bactericidal mechanism, reducing reliance on antibiotics.
• The demonstrated cytocompatibility and antibacterial properties make it promising for advanced medical implant technologies.