FIG. 1.

Effects of curcumin, turmerones, and dimethyl sulfoxide (DMSO) on cell viabilities of Caco-2 cells. Cells were treated with increasing concentrations of compounds for 4, 8, or 24 hours, and cell viability was determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. Results are expressed as percentages of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide absorbance with respect to the untreated vehicle control wells and are mean+SD values of three or four independent experiments with four wells each. *P<.05, **P<.01, compared with the vehicle control group. ar, aromatic.