A bactericidal calix[4]arene-based nanoconstruct with amplified NO photorelease

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Antimicrobial Research

Background:

• Nitric oxide (NO) is a crucial signaling molecule with therapeutic potential.
• Developing efficient NO photodonors for targeted delivery remains a challenge.
• Nanomaterials offer promising platforms for controlled drug release and enhanced therapeutic effects.

Purpose of the Study:

• To synthesize and characterize a novel NO photodonor encapsulated within a supramolecular nanocontainer.
• To investigate the light-triggered NO release efficiency of the nanoconstruct.
• To evaluate the antibacterial efficacy of the NO-releasing nanoconstruct against representative bacterial strains.

Main Methods:

• Synthesis of a hydrophobic N-dodecyl-3-(trifluoromethyl)-4-nitrobenzenamine NO photodonor.
• Encapsulation of the photodonor within a polycationic calix[4]arene derivative to form nanoassemblies (approx. 45 nm).
• Assessment of NO generation upon visible light excitation and evaluation of antibacterial activity against Staphylococcus aureus and Pseudomonas aeruginosa.

Main Results:

• The synthesized nanoconstruct efficiently releases NO upon visible light irradiation.
• NO generation efficiency from the nanoconstruct is significantly higher compared to the free photodonor.
• The nanoassembly exhibits considerable antibacterial activity against both Gram-positive (S. aureus) and Gram-negative (P. aeruginosa) bacteria.

Conclusions:

• The developed supramolecular nanoassembly serves as an effective platform for enhanced NO photodonor delivery.
• Visible light-triggered NO release from this system exhibits potent antibacterial properties.
• This approach holds promise for developing novel antimicrobial strategies utilizing light-activated NO.