Figure 7: Blueberry polyphenolic enriched-extract did not affect the intracellular redox balance in HepG2 cells. Cells were treated with vehicle or 12.5-50 μg/ml of polyphenols for 96 h and intracellular concentration of GSH, GSSG and their ratio (GSH/GSSG) were measured as described in Materials and Methods. Data are reported as the mean ± SEM of three independent experiments, each performed in triplicates. Means that do not share letters are not significantly different from each other at P ≤ 0.05.