New D-π-A-Based Coumarin- Derived Fluorescent Theranostic Probes With Broad-Spectrum Antimicrobial Activity

Area of Science:

• Medicinal Chemistry
• Antimicrobial Research
• Fluorescence Probes

Background:

• Multidrug-resistant (MDR) pathogens necessitate innovative antimicrobial agents and research tools.
• Fluorescent probes aid in understanding antibiotic action and resistance mechanisms.
• Coumarin derivatives are explored for their pharmacokinetic and fluorescence properties.

Purpose of the Study:

• Design and evaluate novel donor-π-acceptor coumarin dyes for antimicrobial activity.
• Assess efficacy against key pathogens: Candida albicans, Escherichia coli, and Staphylococcus aureus.
• Investigate the mechanism of action for promising compounds.

Main Methods:

• Synthesis of donor-π-acceptor coumarin dyes.
• Antimicrobial susceptibility testing against fungal and bacterial strains.
• Reactive oxygen species (ROS) generation assays.

Main Results:

• Coumarin dye I-6 demonstrated significant antimicrobial activity against Staphylococcus aureus and Candida albicans.
• I-6's efficacy is linked to its ability to induce high reactive oxygen species (ROS) formation.
• Congener I-9 showed activity against S. aureus but limited efficacy against other tested strains.

Conclusions:

• Donor-π-acceptor coumarin dyes show potential as antimicrobial agents.
• I-6 is a promising candidate for further development, particularly for targeting S. aureus and C. albicans.
• Future work will focus on fluorescence-based imaging for real-time mechanistic studies.