Figure 4: DPPH scavenging activity of (-)-linalool. The free radical-scavenging activity of (-)- linalool was assessed by DPPH assay. Compared with control cells, 1, 2.5, and 5 μM (-)-linalool increased antioxidant levels in a concentration-dependent manner. Vitamin C (100 μM) was used as a positive control. Data are presented as means ± SEMs (error bars). ** p < 0.01, *** p < 0.001 compared with controls.