BODIPY-Loaded ZIF-8 Nanomaterials for Enhanced Photodynamic Inactivation of Staphylococcus aureus

Area of Science:

• Materials Science
• Nanotechnology
• Photochemistry

Background:

• Antibiotic-resistant pathogens pose a significant global health threat, necessitating novel therapeutic strategies.
• Photodynamic materials offer targeted microbial inactivation, but require enhanced efficacy and stability.
• BODIPY (BDP) dyes are promising photosensitizers, yet their application is limited by stability and ROS generation in aqueous environments.

Purpose of the Study:

• To synthesize and characterize BODIPY (BDP) dyes encapsulated within ZIF-8 nanomaterials for enhanced photodynamic antimicrobial applications.
• To evaluate the reactive oxygen species (ROS) generation, photostability, and photodynamic activity of the BDP@ZIF-8 nanomaterials.
• To assess the efficacy of these nanomaterials in the photoinactivation of *Staphylococcus aureus* and surface decontamination.

Main Methods:

• One-pot nanoprecipitation method for synthesizing BDP dyes confined within ZIF-8.
• Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) for morphological analysis.
• Spectroscopic characterization to confirm dye incorporation and assess ROS generation.
• Antimicrobial assays and fluorescence imaging to evaluate bacterial inactivation efficacy.

Main Results:

• Successful synthesis of BDP@ZIF-8 nanomaterials with confirmed dye incorporation.
• Encapsulation in ZIF-8 significantly enhanced ROS generation and photostability of BDP dyes.
• Br₂BDP@ZIF-8 demonstrated high production of singlet molecular and superoxide anion radicals.
• Efficient photoinactivation of *Staphylococcus aureus* achieved, with >99.999% reduction in liquid cultures and >97% on contaminated surfaces.
• Evidence of effective interaction between BDP@ZIF-8 and *S. aureus* via fluorescence imaging.

Conclusions:

• BDP-loaded ZIF-8 nanomaterials are robust and efficient photosensitizers for bacterial elimination.
• These nanomaterials offer a promising strategy for combating antibiotic-resistant pathogens through photodynamic therapy.
• The developed materials show potential for applications in bacterial cell photokilling and surface decontamination.