Constituents of French Marigold (Tagetes patula L.) Flowers Protect Jurkat T-Cells against Oxidative Stress

Figure 3

Effects of French marigold extracts and purified fractions on the generation of superoxide (a) and peroxyl (b) radicals in Jurkat cells subjected to hydrogen peroxide-induced oxidative stress (EPR signal intensity, arbitrary units). Error bars represent standard deviations of five replications. Values marked with asterisks were significantly different from the control subjected to the same H₂O₂ concentration, according to Student’s -test at values of ≤0.001, ≤0.01, and ≤0.05 designated as , , and , respectively.

(a) Superoxide radical,

(b) Peroxyl radical,