Fig 4.

The fluorescent image of HeLa cells incubated with carbon dots from CA: EDA 1:2 and Hoechst 33342, (A) for blue bright excitation, (B) for UV bright excitation, (C) for overlap of (A) and (B). Fluorescent image of the HeLa cells stained with SYTO RNA-select green fluorescent dye (D). The fluorescent images of HeLa cell incubated with 400 μg/mL of carbon dots made from CA (E), EDA (F), and CA and PEI with CA: EDA 1:0.5 (G) and 1:2 (H) for 24 h. The fluorescent images of LN229 incubated with 400 μg/mL of carbon dots for 4 h (I).