A Green Synthesis Route to Derive Carbon Quantum Dots for Bioimaging Cancer Cells

Area of Science:

• Biomaterials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Carbon quantum dots (CQDs) offer biocompatibility and desirable properties like solubility and photostability for biomedical applications, particularly cell bioimaging.
• Current CQD synthesis methods often involve expensive equipment, toxic chemicals, and lengthy procedures, limiting their widespread adoption.
• There is a need for simpler, more accessible, and cost-effective methods for CQD production.

Purpose of the Study:

• To develop a facile, rapid, and cost-effective method for synthesizing carbon quantum dots (CQDs).
• To utilize readily available bread slices as precursors for CQD synthesis, avoiding additional chemicals.
• To evaluate the efficacy of the synthesized CQDs for bioimaging of colon cancer cells.

Main Methods:

• A novel toasting method was employed to synthesize CQDs from various bread types.
• The synthesis process was significantly faster (2 hours) compared to conventional hydrothermal methods (10 hours).
• No additional toxic chemicals or expensive equipment were required for the toasting synthesis.

Main Results:

• The toasting method successfully produced CQDs with properties suitable for biomedical applications.
• CQDs synthesized via toasting demonstrated effective bioimaging of both mouse (CT-26) and human (HT-29) colon cancer cell lines.
• The bioimaging performance, in terms of brightness, was comparable to CQDs produced using the traditional hydrothermal method.

Conclusions:

• A rapid, cost-effective, and chemical-free toasting method enables the production of CQDs from bread.
• These bread-derived CQDs are suitable for bioimaging applications, offering a promising alternative to conventional synthesis routes.
• This approach democratizes CQD synthesis, making them more accessible for research and potential clinical use.