Zn-doped mesoporous hydroxyapatites and their antimicrobial properties

Area of Science:

• Biomaterials Science
• Nanotechnology
• Antimicrobial Research

Background:

• Zinc-based materials are increasingly recognized for their antimicrobial properties.
• Mesoporous hydroxyapatites (mHAps) offer high surface area for potential biomedical applications.
• Developing effective antimicrobial agents is crucial for combating bacterial infections.

Purpose of the Study:

• To synthesize zinc-doped mesoporous hydroxyapatites (Zn-mHAps) using a phosphoprotein template.
• To investigate the structural and morphological characteristics of the synthesized Zn-mHAps.
• To evaluate the antibacterial efficacy of Zn-mHAps against Gram-positive and Gram-negative bacteria.

Main Methods:

• Co-precipitation method utilizing a phosphoprotein as a porous template.
• Nitrogen adsorption/desorption for surface area and pore size analysis.
• Characterization using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS).
• Antibacterial activity testing against Staphylococcus aureus and Escherichia coli.

Main Results:

• Successful synthesis of zinc-doped mesoporous hydroxyapatites with large pores and a high specific surface area (182 m² g⁻¹).
• Confirmation of Zn-mHAp formation through various analytical techniques.
• Zn2%-mHAp demonstrated significant bacterial inhibition: 50 ± 5% for Gram-positive and 77 ± 5% for Gram-negative bacteria.
• Antibacterial activity correlated directly with the Zn²⁺ content in the mHAp samples.

Conclusions:

• The phosphoprotein-templated synthesis is an effective strategy for creating novel HAp-based biomaterials.
• Zinc-doped mesoporous hydroxyapatites exhibit promising antibacterial properties, dependent on Zn²⁺ concentration.
• This approach provides a new pathway for functionalizing materials for diverse biomedical applications.