Fig. 13
From: Penetration of CdSe/ZnS quantum dots into differentiated vs undifferentiated Caco-2 cells
Membrane integrity measurements using CellTox™ Green Assay. Membrane integrity was measured after 3 days exposure of undifferentiated cells to QD-COOH, QD-NH2 and QD-PEG (45 µg cadmium ml−1). Interference with the assay was tested by addition of QDs to positive control Triton X-100 (positive ctr + QDs) shortly prior fluorescence measurement or by adding Triton X-100 to cells exposed to QDs for 3 days (QD + Triton X-100)