Polymeric ruthenium precursor as a photoactivated antimicrobial agent

Area of Science:

• Materials Science
• Nanotechnology
• Biochemistry

Background:

• Ruthenium compounds show anticancer and antibacterial potential.
• Poor solubility and stability limit therapeutic use.
• Polymer encapsulation/conjugation is complex.

Purpose of the Study:

• Evaluate antibacterial activity of polymeric ruthenium carbonyl precursor [Ru(CO)2Cl2]n.
• Investigate photo-enhanced antimicrobial effects.
• Assess biocompatibility with mammalian cells.

Main Methods:

• Tested antibacterial activity against Escherichia coli and Staphylococcus aureus.
• Determined minimum inhibitory concentration (MIC).
• Microscopic analysis of bacterial membrane disruption and stress response.
• Biocompatibility testing on mammalian cells.

Main Results:

• [Ru(CO)2Cl2]n exhibits MIC in the nanogram/mL range.
• Antimicrobial activity significantly enhanced by UV photoirradiation.
• Mechanism involves bacterial membrane disruption and stress response.
• Effective at 6.6 ng/mL with high biocompatibility for mammalian cells.

Conclusions:

• Polymeric ruthenium carbonyl [Ru(CO)2Cl2]n is a novel, potent antimicrobial agent.
• Photoirradiation enhances antibacterial efficacy.
• Demonstrates high activity and low toxicity, addressing the need for new antimicrobials.