Bioactive Coatings for Biomedical Applications
Summary
Bioactive coatings are engineered surface layers applied to medical implants and devices to enhance their interaction with biological tissues. These coatings aim to promote tissue integration, stimulate healing and prevent infection. Central to this field are hydroxyapatite-based materials, chosen for their compositional similarity to bone mineral and their ability to support osteogenesis. By substituting calcium sites with therapeutic ions such as zinc, silver or strontium, researchers have created multifunctional coatings that combine antimicrobial efficacy with osteoconductive and osteoinductive properties. Deposition techniques including sol–gel processing, plasma spraying, electrochemical methods and layer-by-layer assembly yield uniform, adherent films on metallic and polymeric substrates. Composite formulations, for example combining hydroxyapatite with chitosan or graphene derivatives, further enhance mechanical resilience, controlled release of bioactive agents and cell compatibility. Emerging approaches focus on stimuli-responsive systems that deliver on-demand antimicrobial action or growth-factor release, as well as nanoscale topographies that modulate immune responses. Such advances address clinical imperatives for long-lasting orthopaedic and dental implants with reduced infection rates and improved functional integration.
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Bioactive Coatings for Biomedical Applications publication trend
The graph below shows the total number of articles in bioactive coatings for biomedical applications across all publications each year (not limited to Nature Index journals).
Technical terms
Hydroxyapatite: A calcium phosphate mineral (Ca₁₀(PO₄)₆(OH)₂) used as a bioactive coating to promote bone integration.
Doping: The intentional incorporation of trace ions (e.g., Zn²⁺, Ag⁺) into a host material to tailor its biological and physicochemical properties.
Sol–gel method: A chemical process that forms ceramic or glass coatings by transitioning a colloidal solution into a solid gel on a substrate.
Cytocompatibility: The ability of a material to support cell viability, proliferation and normal function without inducing toxicity.
Chitosan: A biocompatible polysaccharide derived from chitin, used in composite coatings for its film-forming and antimicrobial properties.
References
- Development of Zinc-Doped Hydroxyapatite by Sol-Gel Method for Medical Applications. Molecules (2018).
- Antibacterial and Cellular Behaviors of Novel Zinc-Doped Hydroxyapatite/Graphene Nanocomposite for Bone Tissue Engineering. International Journal of Molecular Sciences (2021).
- Fabrication of Silver- and Zinc-Doped Hydroxyapatite Coatings for Enhancing Antimicrobial Effect. Coatings (2020).
- Zinc Doped Hydroxyapatite Thin Films Prepared by Sol–Gel Spin Coating Procedure. Coatings (2019).
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