ZrO₂-ZnO Nanoparticles as Antibacterial Agents

Area of Science:

• Materials Science
• Nanotechnology
• Microbiology

Background:

• Antibiotic resistance is a growing global health threat, necessitating the development of novel antibacterial agents.
• Metal oxide nanoparticles are being explored for their antimicrobial properties due to their unique characteristics.

Purpose of the Study:

• To synthesize and characterize pure zirconium dioxide (ZrO2) and zinc oxide (ZnO) nanoparticles.
• To evaluate the antibacterial activity of these nanoparticles and their mixed ZrO2-ZnO counterparts against Gram-positive and Gram-negative bacteria.

Main Methods:

• Nanoparticles were synthesized using the sol-gel method.
• Physicochemical characterization was performed using dynamic light scattering, X-ray diffraction (XRD), and scanning electron microscopy (SEM).
• Antibacterial activity was tested against Bacillus subtilis, Streptococcus mutans, Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and Klebsiella oxytoca.

Main Results:

• ZrO2, ZnO, and ZrO2-ZnO nanoparticles were successfully synthesized with sizes ranging from 22 to 76 nm.
• SEM confirmed spherical nanoparticle morphology, while XRD indicated monoclinic zirconia and hexagonal zinc oxide structures.
• ZnO, ZrO2-ZnO (Z-Z1.0), and ZrO2-ZnO (Z-Z2.0) demonstrated significant inhibition against all tested bacteria, whereas pure ZrO2 and amorphous mixed oxides showed no activity.

Conclusions:

• ZnO and specific compositions of ZrO2-ZnO nanoparticles exhibit potent antibacterial activity.
• These metal oxide nanoparticles show promise as alternative agents to combat bacterial infections and antibiotic resistance.