Systematic safety evaluation on photoluminescent carbon dots

Area of Science:

• Nanotechnology
• Materials Science
• Biomedical Engineering

Background:

• Photoluminescent carbon dots (C-dots) are emerging nanomaterials with diverse applications.
• Their synthesis and safety evaluation are crucial for clinical translation.
• Nitric acid oxidation is a common method for C-dot preparation.

Purpose of the Study:

• To synthesize photoluminescent carbon dots (C-dots) using an improved nitric acid oxidation method.
• To characterize the physicochemical properties of the synthesized C-dots.
• To conduct a comprehensive safety evaluation of the C-dots in vivo.

Main Methods:

• Improved nitric acid oxidation for C-dot synthesis.
• Characterization using tapping-mode atomic force microscopy and UV-vis absorption spectroscopy.
• Safety assessment including acute toxicity, subacute toxicity, and genotoxicity tests (micronuclear and Ames tests).

Main Results:

• Successful synthesis of stable, highly dispersible, and water-soluble C-dots.
• Characterization confirmed desired physicochemical properties.
• No significant toxic effects or organ abnormalities observed in mice across all tested C-dot dosages.

Conclusions:

• The synthesized C-dots are non-toxic to mice, even at high doses.
• These findings support the potential of C-dots for in vivo applications like fluorescence imaging and tumor cell tracking.
• Further research into their biomedical applications is warranted.