Figure 3.

Cytotoxicity evaluation of Rb1 (n = 3). The cytotoxicity of Rb1 and the Rb1-Dic micelle was tested on Human corneal epithelial cells (HCECs; ATCC CRL-11135) using standard MTT testing. HCECs were incubated with the indicated concentrations of ginsenoside Rb1 for 24, 48, and 72 h, followed by 4 hours incubation with MTT. The MTT transformed crystals were dissolved in DMSO and absorbance at 490 nm was measured. Absorbances were normalized to the untreated control cultures, which represented 100% viability.