Nona-Arginine Facilitates Delivery of Quantum Dots into Cells via Multiple Pathways

Figure 3

Time-dependent uptake of QD/SR9. QDs were premixed with SR9 at a molecular ratio of 1 : 20. A549 cells were treated with QD/SR9 at 150 nM QD concentration for 5 min, 20 min, 40 min, 1 hour, and 3 hours. Values are mean±SD from three independent experiments. Fluorescence intensity is normalized relative to the value at 5 min. ^∗𝑃<.01 versus 5 min; ^𝛼𝑃<.01 versus 20 min; ^𝛽𝑃<.01 versus 40 min.