Dual-functionalized carbon dots with precise antibacterial activity through specific recognition and enzyme...

Area of Science:

• Biomaterials Science
• Nanotechnology
• Antimicrobial Research

Background:

• Growing threat of drug-resistant bacteria necessitates novel antimicrobial agents.
• Existing therapies face limitations due to toxicity and resistance.
• Carbon dots (CDs) present a promising nanomaterial platform for antimicrobial development due to biocompatibility and tunable properties.

Purpose of the Study:

• To design and synthesize functional carbon dots (CDs) with selective bacterial recognition and potent antibacterial activity.
• To investigate the mechanism of action of these functional CDs against bacteria.
• To develop a mathematical model for understanding the dynamic antibacterial action of CDs.

Main Methods:

• Synthesis of functional CDs from phytic acid (PA) and citric acid (CA) via electro-polymerization.
• Evaluation of selective cellular uptake (bacterial vs. human cells).
• Assessment of antibacterial activity via DNA polymerase I inhibition and mathematical modeling.

Main Results:

• Synthesized CDs exhibit dual functionality: specific bacterial recognition and metal chelation.
• CDs selectively penetrate bacterial cells but not human skin cells.
• CDs effectively bind to and inactivate bacterial DNA polymerase I, demonstrating antibacterial action (IC50: 344.4 μg mL⁻¹).
• A mathematical model was developed to elucidate the antibacterial mechanism.

Conclusions:

• Functional CDs offer a precise and resistance-resistant antimicrobial strategy.
• The study provides valuable insights into the design of CDs for targeted antibacterial therapies.
• This research advances the development of novel solutions to combat bacterial infections.