Photoactive NO hybrids with pseudo-zero-order release kinetics for antimicrobial applications

Area of Science:

• Medicinal Chemistry
• Antimicrobial Drug Development
• Biofilm Research

Background:

• Bacterial infections pose a significant global health threat, exacerbated by increasing antimicrobial drug resistance.
• Biofilm formation is a key mechanism in bacterial pathogenesis and resistance.
• Nitric oxide (NO) plays a crucial role in regulating bacterial biofilm development.

Purpose of the Study:

• To design and synthesize novel nitric oxide (NO) hybrids for effective antibacterial applications.
• To investigate the photoactivated release of NO from these hybrids and their kinetics.
• To evaluate the antimicrobial efficacy of these NO hybrids against Staphylococcus aureus biofilms.

Main Methods:

• Synthesis of benzothienoazepine-based NO hybrids conjugated with quaternary ammoniums or phosphoniums.
• Photoactivation strategy for temporal NO release.
• Kinetic analysis of NO release using fluorescence measurements.
• In vitro assessment of antibiofilm activity against S. aureus, comparing dark conditions and irradiation.

Main Results:

• Novel NO hybrids were successfully synthesized, featuring a benzothienoazepine scaffold.
• Photoactivation enabled tunable, pseudo-zero-order NO release, quantifiable via fluorescence.
• The triphenyl phosphonium (TPP) NO hybrid demonstrated superior S. aureus biofilm inhibition in darkness compared to ciprofloxacin.
• Irradiation significantly enhanced antibiofilm activity, highlighting synergistic effects of NO and the released product.

Conclusions:

• The developed NO hybrids represent promising candidates for novel antimicrobial agents.
• This study offers a new paradigm for designing highly effective antibiofilm therapies.
• The combined action of NO and the hybrid scaffold provides a potent strategy against resistant bacterial biofilms.