Exploring the various effects of Cu doping in hydroxyapatite nanoparticle

Area of Science:

• Biomaterials Science
• Nanotechnology
• Materials Chemistry

Background:

• Hydroxyapatite (HAp) is a key biomaterial, but its properties can be enhanced by incorporating foreign ions.
• Copper (Cu) doping is explored to improve HAp's functionality for biomedical applications.

Purpose of the Study:

• To investigate the effects of copper substitution in hydroxyapatite nanoparticles.
• To evaluate the impact of copper doping on HAp's structural, degradation, antibacterial, and biocompatibility properties.

Main Methods:

• Hydroxyapatite nanoparticles were synthesized with varying copper concentrations (1%, 3%, 5%).
• X-ray Diffraction (XRD) was used to analyze structural changes.
• Degradation, zeta potential, protein adsorption, antibacterial assays (E. coli, S. aureus), cell differentiation (ALP, Alizarin Red), and cell migration (scratch test) were performed.

Main Results:

• Copper incorporation slightly decreased lattice parameters and crystallinity without forming a distinct copper phase.
• Copper doping doubled calcium ion release and increased zeta potential and protein adsorption.
• 5% copper-doped HAp demonstrated significant antibacterial activity against E. coli and S. aureus.
• Copper-doped HAp enhanced stem cell differentiation and HUVEC cell migration, indicating improved biocompatibility and angiogenesis.

Conclusions:

• Copper substitution is a viable strategy to enhance hydroxyapatite's antibacterial efficacy and biocompatibility.
• Copper-doped HAp shows promise for applications requiring antimicrobial and osteogenic properties.
• The study highlights the potential of copper-hydroxyapatite nanocomposites in regenerative medicine and infection control.