ZnO-Hydroxyapatite Composite: A Synergistic Approach to Antibacterial Material Design
Keywords:
zinc oxide, hydroxyapatite, antibacterial, orthopedic implants, biomaterialsAbstract
The rising occurrence of implant-associated infections has underscored the necessity for multifunctional biomaterials that can facilitate bone regeneration while simultaneously inhibiting bacterial colonization. Zinc oxide-hydroxyapatite (ZnO-HA) composites offer a promising solution by combining the osteoconductive properties of hydroxyapatite (HA) with the antibacterial effects of zinc oxide (ZnO) nanoparticles. This study aims to synthesize and characterize ZnO-HA composites and evaluate their antibacterial efficacy against Escherichia coli and Staphylococcus aureus, two common pathogens implicated in medical implant infections. ZnO-HA composites were synthesized and characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and Fourier-transform infrared spectroscopy (FTIR). Antibacterial activity was tested through in vitro assays against E. coli and S. aureus, comparing the effectiveness of ZnO-HA composites to that of pure HA. XRD, SEM, and EDS confirmed the successful integration of ZnO nanoparticles into the HA matrix. FTIR analysis revealed characteristic absorption bands for both ZnO and HA, indicating a stable composite structure. The ZnO-HA composite exhibited significantly enhanced antibacterial activity, with inhibition zones of 2.1 cm for E. coli and 1.8 cm for S. aureus, compared to 1.2 cm for pure HA against E. coli and no inhibition against S. aureus. The ZnO-HA composite demonstrated superior antibacterial efficacy compared to pure HA, while retaining the osteoconductive properties of the HA matrix. This dual functionality positions ZnO-HA as a highly promising material for use in orthopedic and dental implants. Future research should focus on optimizing synthesis methods and conducting in vivo studies to assess the composite’s performance in biological environments.
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Copyright (c) 2025 G.D. Gishoni, Suganya Panneer Selvam, Radha Gosala, Ramya Ramadoss, Sandhya Sundar (Author)
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