Fig. 1.

MTS assays showing that cell viability was different at various concentration of curcumin, and as concentration increased, cell viability tended to decrease. a At 10 μM/L concentrations of curcumin, cell viabilities showed minimal decrease (80.05%). And at 30 μM/L concentrations of curcumin, cell viabilities decreased to 53.2% (p = 0.002), at 50 μM/L concentrations of curcumin, cell viabilities decreased to 37.63% (p = 0.000). b The cell viabilities at 10 and 20 μM/L concentrations of curcumin for 48 h were 55% and 42.9% (p = 0.003). For 72 h, the cell viabilities at 10 and 20 μM/L concentrations of curcumin were 41.5% and 39% (p = 0.000)