Fluorescent Nanocrystals Reveal Regulated Portals of Entry into and Between the Cells of Hydra
Figure 4
Zeta potential of the amino-PEG coated QRs as a function of pH.
Zeta potential is widely used to quantify the electrical charge in colloidal systems [37]. While at neutral pH all amino-PEG QR samples display negative zeta potential, at pH 4 only QR-A (blu line) and QR-C (red line) presented positive values, showing the involvement of QR positive charge in the cell uptake. Measurements were performed in SolHy.