Cationic Polymer Brushes Functionalized with Carbon Dots and Boronic Acids for Bacterial Detection and Inactivation

Area of Science:

• Biomaterials Science
• Nanotechnology
• Infectious Diseases

Background:

• Drug-resistant bacterial infections pose a significant threat to public health.
• Effective detection and inactivation of pathogenic bacteria are critical therapeutic goals.

Purpose of the Study:

• To design and synthesize multifunctional nanocomposites for bacterial binding, fluorescence labeling, and synergistic antibacterial treatment.
• To develop a novel strategy for bacterial detection, imaging, and deactivation.

Main Methods:

• Surface-initiated atom transfer radical polymerization was used to introduce cationic polymers with quaternary ammonium compounds onto silica nanoparticles.
• Copper-doped carbon dots were incorporated, followed by boronic acid modification.
• The nanocomposites were characterized for their bacterial binding capacity, fluorescence imaging capabilities, and antibacterial efficacy.

Main Results:

• The developed nanocomposites demonstrated enhanced bacterial binding due to cationic polymer units and boronic acid end groups.
• Stable fluorescence signals were generated around bacteria, enabling effective fluorescence imaging.
• Synergistic antibacterial effects were observed, showing significant bacterial deactivation.

Conclusions:

• The multifunctional nanocomposites offer a promising approach for bacterial labeling, imaging, and synergistic treatment.
• This strategy provides a novel method for addressing drug-resistant bacterial infections.
• The study highlights the potential of advanced nanomaterials in combating infectious diseases.