Figure 2. Radical scavenging activities of stilbenoids 1–5 on DPPH and OH radicals.

Results are expressed as IC₅₀ (mean ± sd) of stilbenoids determined on DPPH and ^•OH radicals scavenging. IC₅₀: concentration causing half-maximal neutralization of radical DPPH or ^•OH. Quercetin was used as standard reference. IC₅₀ values were compared to those obtained with the standard reference. Statistical significance (*) was set at p<0.05.