The heterogeneity of physiological activity for chiral carbon dots derived from L/D/DL-arginine.

Chirality is a ubiquitous phenomenon in nature. The advent of nanomaterials has led to a gradual evolution of chiral studies from the molecular scale to the nanoscale. The emergence of carbon dots (CDs) has inaugurated a novel domain in the scientific and technological realms of carbon nanomaterials. In recent years, CDs have attracted increasing attention due to their luminescent properties, excellent biocompatibility and remarkable bioactivity. However, little attention has been paid to the chirality of the CDs and, in particular, the differences between CDs synthesized from racemic compounds and other chiral CDs, as well as the differences in the biological effects of chiral CDs, remain to be explored. Here, chiral CDs were synthesized from L-/D-/DL-arginine, and the differences in various aspects of chiral CDs were evaluated. We found that L-CDs without extreme differences in structure had brighter fluorescence and a more significant ability of NO generation and lipid droplet inhibition than the other two chiral CDs. Combined with its better drug loading and release ability, we validated its superior efficacy in tumor treatment. Therefore, this study provides a basis for further research on chiral carbon dots and their differences.