Antibacterial and Cytocompatible Nanoengineered Silk-Based Materials for Orthopedic Implants and Tissue Engineering

Area of Science:

• Biomaterials Science
• Surface Engineering
• Nanotechnology

Background:

• Postsurgical infections often arise from bacteria colonizing implant surfaces.
• Antibiotic use can lead to antimicrobial resistance, necessitating alternative solutions.
• Biocompatible materials with intrinsic antibacterial properties are highly desirable.

Purpose of the Study:

• To engineer a natural silk film with inherent antibacterial resistance.
• To investigate the effect of nanopatterning on bacterial attachment and cell proliferation.
• To create a biocompatible material that mitigates postsurgical infections without antibiotics.

Main Methods:

• Fabrication of homogeneous nanocones on Bombyx mori silk films using oxygen plasma etching.
• Surface characterization to analyze changes in surface energy and chemical bonds.
• Quantitative assessment of bacterial attachment (Escherichia coli, Staphylococcus aureus) and osteoblast cell proliferation.

Main Results:

• Oxygen plasma etching created hydrophilic nanocones, increasing surface energy by 176%.
• Bacterial attachment was reduced by over 90% for both Gram-negative and Gram-positive bacteria.
• Osteoblast cell proliferation improved by 30% on the nanoengineered silk surface.
• Significantly higher cell proliferation observed due to limited bacterial attachment and prevention of biofilm formation.

Conclusions:

• Nanoengineered silk films exhibit excellent biocompatibility and intrinsic antibacterial resistance.
• This approach offers a promising alternative for developing medical implants that reduce infection risk.
• The study highlights a novel strategy to minimize antibiotic usage in post-surgical care.