Figure 4
Cellular labeling and cytotoxicity of CS-ZnS and CS-ZnS:Mn 2+ QDs in PANC-1 cells. (A) LSCM images of PANC-1 cells labeled with 10 μg mL-1 of CS-ZnS and CS-ZnS:Mn2+ QDs. Nuclei were stained with 5 μg mL-1 PI. Cells were incubated with QDs for 2 h before imaging. The scale bar represents 30 μm. (B) The metabolic activity of PANC-1 cells exposed to TGA-CdSe, CS-ZnS, and CS-ZnS:Mn2+ QDs. The final concentrations of QDs in the medium were 0, 10, 50, 200, and 1,000 μg mL-1. Cells were incubated with QDs for 2 h before MTT assays. Data represent mean ± SD for three independent experiments.