Biocompatible antibiotic-coupled nickel-titanium nanoparticles as a potential coating material for biomedical devices

Area of Science:

• Biomaterials Science
• Nanotechnology
• Orthopedic Surgery

Background:

• Metallic implants face challenges like ion leaching, modulus mismatch, and infection risk.
• Nitinol (NiTi) offers shape memory and superelasticity but has limitations in biocompatibility and antibacterial properties.
• Surface modification and antibiotic functionalization are key strategies to enhance implant performance.

Purpose of the Study:

• To develop and characterize surface-modified NiTi nanoparticles for improved biomedical applications.
• To assess the biocompatibility and neuro-regenerative potential of modified NiTi nanoparticles.
• To evaluate the antibacterial efficacy of antibiotic-functionalized NiTi nanoparticles against common implant-associated bacteria.

Main Methods:

• NiTi nanoparticles were modified with phosphonic acid monolayers and functionalized with ceftriaxone and vancomycin.
• Surface modifications were confirmed using elemental analysis and microscopy techniques.
• Biocompatibility was assessed via neuroblastoma cell culture, and antibacterial activity was tested against E. coli, S. marcescens, and B. subtilis.

Main Results:

• Surface modifications were stable, confirmed by elemental composition (Ni, Ti, P) and ordered film formation.
• Modified NiTi nanoparticles demonstrated high biocompatibility, supporting neuroblastoma cell survival and neurite extension.
• Functionalized NiTi nanoparticles exhibited significant antibacterial activity against E. coli, S. marcescens, and B. subtilis.

Conclusions:

• Surface-modified NiTi nanoparticles show promise as a biocompatible coating for metallic bone and nerve implants.
• The developed nanoparticles effectively inhibit common bacteria associated with implant infections.
• This approach addresses key challenges in reconstructive surgery, enhancing implant safety and efficacy.