Vancomycin-modified Fe₃O₄@SiO₂@Ag microflowers as effective antimicrobial agents

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Nanomaterials combined with antibiotics show synergistic antimicrobial effects.
• Developing novel antibacterial agents is crucial for combating resistant bacteria.

Purpose of the Study:

• To design and prepare vancomycin-modified magnetic silver microflowers (Van/Fe3O4@SiO2@Ag) for enhanced antibacterial properties.
• To evaluate the bactericidal ability, antimicrobial spectrum, and recyclability of the fabricated nanomaterial.

Main Methods:

• Synthesis of Fe3O4@SiO2@Ag microflowers with a magnetic core and silver shell.
• Modification of microflowers with vancomycin.
• Testing antimicrobial activity against Escherichia coli and methicillin-resistant Staphylococcus aureus.
• Assessing synergistic effects and recyclability.

Main Results:

• Van/Fe3O4@SiO2@Ag microflowers exhibited strong bactericidal activity with minimum inhibitory concentrations of 10 μg mL−1 for E. coli and 20 μg mL−1 for S. aureus.
• The modified microflowers showed enhanced efficacy compared to bare microflowers and free vancomycin, confirming synergistic effects.
• Antimicrobial activity remained above 90% after five cycles, indicating high stability and recyclability.

Conclusions:

• Van/Fe3O4@SiO2@Ag microflowers are effective and eco-friendly antibacterial agents.
• The synergistic combination of vancomycin and silver microflowers offers a promising strategy for antibacterial applications.
• The magnetic and recyclable nature of the microflowers enhances their practical utility.