Hydroxyapatite particles substituted with Pd ions for remarkable antibacterial performance

Area of Science:

• Biomaterials Science
• Nanotechnology
• Infectious Diseases

Background:

• Bacterial infections pose a significant threat to human health, driving the need for advanced antibacterial materials.
• Hydroxyapatite (HAP), a bone- and tooth-like material, shows potential antibacterial properties via electrostatic repulsion but has limited efficacy.
• Enhancing HAP's antibacterial activity is crucial for its broader application in healthcare and environmental safety.

Purpose of the Study:

• To develop a simple, one-step synthesis method for palladium (Pd)-substituted hydroxyapatite (HAP) nanoparticles.
• To investigate the antibacterial performance of Pd-substituted HAP against clinically relevant bacterial strains.
• To establish the correlation between palladium ion substitution levels and antibacterial efficacy.

Main Methods:

• One-step synthesis of hydroxyapatite (HAP) particles with partial substitution of calcium ions (Ca²⁺) by palladium ions (Pd²⁺).
• Characterization of the synthesized HAP particles and assessment of Pd substitution within the HAP lattice.
• Evaluation of antibacterial activity against *Staphylococcus aureus*, *Klebsiella pneumoniae*, and *Escherichia coli*.

Main Results:

• Successful synthesis of hydroxyapatite particles with controlled palladium ion substitution.
• Pure HAP particles exhibited approximately 97.5% antibacterial activity.
• Palladium (5%)-substituted HAP demonstrated ultrahigh antibacterial performance, exceeding 99.9% efficacy against all tested bacteria.

Conclusions:

• Palladium substitution significantly enhances the antibacterial activity of hydroxyapatite.
• The developed Pd-substituted HAP is a highly effective antibacterial material with potential applications in promoting human health.
• This study provides valuable insights for designing advanced antibacterial biomaterials for safe and clean environments.