Fig. 3

Results (percent change) are expressed as mean ± SEM of 4–6 separate observations. Each observation was made from a single rat. MAO-A activity was measured using serotonin as a substrate. Patchouli oil exposure was given at different dosages (2, 5, and ten drops). The control value of young rat blood platelet MAO-A activity (∆OD/mg protein/h) is 1.61 ± 0.033. Other details are described in the “Materials and methods” section. Significant difference was from control young rats with (i) two drops ^a p < 0.001, (ii) five drops ^b p < 0.001, ^c p < 0.01 and (iii) ten drops ^d p < 0.001, ^e p < 0.01