Concentration (mg g–1 of dry sample) of main phenolic compounds and antioxidant activity (DPPH and ABTS methods, expressed as TE, and TPC expressed as GAE) in SWE extracts of Mentha x rotundifolia from different annuities obtained with a s/v of 0.08 g mL–1 at 120ºC for 5 min and with 2 extraction cycles
Samples | Concentration (mg g–1 of dry sample) | TPC (GAE, mg mL–1) | ABTS (TE, mg mL–1) | DPPH (TE, mg mL–1) | ||||
---|---|---|---|---|---|---|---|---|
Luteolin 7-O-glucoside | Rosmarinic acid | Salvianolic acid B | Caffeic acid | Chlorogenic acid | ||||
MR14 | 0.047 (0.003) | 4.16 (0.02)a | 0.49 (0.01)a | 0.059 (0.006)a | 0.004 (0.001)a | 6.8 (0.5)b | 11.6 (1.4)a | 11.0 (0.3)a |
MR15 | 0.051 (0.001)a | 3.62 (0.02)a,b | 0.32 (0.02)a | 0.06 (0.01)a | 0.0044 (0.0003)a | 8.2 (0.8)a | 16.2 (0.6)a | 11.0 (1.2)a |
MR16 | 0.050 (0.006)a | 3.36 (0.04)b | 0.345 (0.001)a | 0.039 (0.005)a | 0.0032 (0.0003)a | 5.7 (0.1)b | 13.41 (1.69)a | 12.4 (0.1)a |
MR17 | 0.06 (0.03)a | 2.5 (0.1)c | 0.5 (0.1)a | 0.043 (0.008)a | 0.0033 (0.0007)a | 6.5 (0.2)b | 15.75 (1.17)a | 10.4 (0.4)a |
Mean value and standard deviation in parentheses (n = 3); a,b,c different letters in the same column indicate significant (P < 0.05) differences among extracts of M. rotundifolia collected in different annuities