Phenylboronic acid-functionalized silver nanoparticles for highly efficient and selective bacterial killing.

Area of Science:

• Materials Science
• Nanotechnology
• Antimicrobial Agents

Background:

• Increasing antibiotic resistance necessitates novel antibacterial agents.
• Severe infections by unknown pathogens are a growing concern.
• Need for agents with high antibacterial efficiency and selective bacterial killing.

Purpose of the Study:

• To develop functionalized silver nanoparticles (AgNPs) with enhanced antibacterial properties.
• To investigate the mechanism of enhanced antibacterial action.
• To evaluate the selectivity and efficacy of the functionalized AgNPs.

Main Methods:

• Surface functionalization of silver nanoparticles (AgNPs) with phenylboronic acid (PBA).
• Characterization using scanning electron microscopy (SEM).
• Evaluation of antibacterial efficiency, selectivity (IC50/MBC ratio), and in vivo wound healing model.

Main Results:

• Phenylboronic acid functionalization (AgNPs-PBA) significantly enhances interaction with bacterial surfaces via cis-diol binding.
• AgNPs-PBA demonstrated 32 times higher antibacterial efficiency compared to bare AgNPs.
• AgNPs-PBA exhibited high selectivity, with an IC50/MBC ratio over 160, and accelerated wound healing in vivo.

Conclusions:

• Phenylboronic acid surface functionalization is an effective strategy to enhance AgNP antibacterial activity.
• AgNPs-PBA show potent and selective antibacterial action through membrane disruption.
• This approach offers a promising avenue for developing advanced silver-based antibacterial nanomaterials.