Table 2. Free radical scavenging capacities of the essential oils measured by the DPPH and ABTS methods.
| Plant source | Fresh | After 12 months of storage |
||
|---|---|---|---|---|
|
c(DPPH)*/ (mmol/L) |
c(ABTS)((mmol/L) |
c(DPPH)*/ (mmol/L) |
c(ABTS)/(mmol/L) | |
| Lavender | (18.9±0.2)a | (48.6±0.7) a | (11.9±0.2)a | (22.3±0.3)a |
| Bergamot | (17.0±0.4)a | (99.0±1.0)b | (9.6±0.9)a | (62.8±0.3)b |
| Tea tree | (7.6±1.0)b | (168.7±1.4)c | (5.8±0.2)b | (120.2±0.8)c |
| Peppermint | (23.3±1.0)c | (190.9±2.5)d | (16.5±0.4)c | (141.6±0.8)d |
Expressed as Trolox equivalent per litre of the essential oil solution. Values are expressed as mean±standard deviation (N=3). Mean values with a different letter in superscript within the same column are significantly different from each other (Tukey-Kramer post hoc test, p<0.05)