Figure 6: Blueberry polyphenols did not affect the intracellular concentration of reactive oxygen species in HepG2 cells. Cells were treated with vehicle or 12.5-50 μg/ml of polyphenols for 96 h and intracellular ROS concentration was measured as described in material and methods. Fluorescence intensities were converted to nM using a specific ROS standard curve. Data are reported as the mean ± SEM, n=8. Means that do not share letters are not significantly different from each other at P ≤ 0.05.