Fig. 4.

Cellular antioxidant activity of exogenous GSH and catechins in HT29 cells – Panel A, Panel B – grouping antioxidant potential of tested compounds as regards physiological concentrations potentially occurring in blood (1–10 µM) and concentrations reachable in alimentary tract (100–1000 µM); Panel C – the impact of individual compounds on cellular antioxidant activity in HT29 cells. Results are means ± SD of three independent experiments. Different letters for the same concentration indicate a significant difference in the one way ANOVA with Tukey test (p < 0.05).