Figure 4.

The effect of prenylflavonoids on the enzymatic activity of glutathione S-transferase (a), sulfotransferase (b) and catechol-O-methyltransferase (c) in the proliferating CaCo-2 cells after a 24 h and 72 h treatment with 1 µM of prenylflavonoid. The enzymatic activities were assayed using colorimetric assays. Data presented as percentage of the respective control (=100%) represent the mean ± S.D. of 3–4 independent experiments. Statistical analyses were performed using a one-way ANOVA with Dunnett’s test: p < 0.05 (*), p < 0.001 (§§§); * different from control after 24 h, $ different from control after 72 h.