Antioxidant activity (DPPH and ABTS methods, expressed as TE, and TPC expressed as GAE) of Mentha x rotundifolia MR16 extracts obtained by UAE, MAE, and SWE at 50ºC for 5 min
| Technique | TPC (GAE, mg mL–1) | ABTS (TE, mg mL–1) | DPPH (TE, mg mL–1) |
|---|---|---|---|
| UAE bath | 5.7 (0.1) | 3.3 (0.2)a,b | 4.4 (0.5)c |
| UAE 12 mm probe | 3.38 (0.06)c | 2.4 (0.5)b | 5.0 (0.9)c |
| UAE 3 mm probe | 1.85 (0.04)d | 1.7 (0.2)b | 2.6 (0.8)d |
| MAE | 3.03 (0.06)c | 4.3 (0.5)a | 9.9 (0.9)b |
| SWE | 4.5 (0.2)b | 4.3 (0.1)a | 11.2 (0.5)a |
Mean value and standard deviation in parentheses (n = 3); a,b,c,d different letters in the same column indicate significant (P < 0.05) differences among the techniques evaluated