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

SamplesConcentration (mg g–1 of dry sample)TPC (GAE, mg mL–1)ABTS (TE, mg mL–1)DPPH (TE, mg mL–1)
Luteolin 7-O-glucosideRosmarinic acidSalvianolic acid BCaffeic acidChlorogenic acid
MR140.047 (0.003)*,a4.16 (0.02)a0.49 (0.01)a0.059 (0.006)a0.004 (0.001)a6.8 (0.5)b11.6 (1.4)a11.0 (0.3)a
MR150.051 (0.001)a3.62 (0.02)a,b0.32 (0.02)a0.06 (0.01)a0.0044 (0.0003)a8.2 (0.8)a16.2 (0.6)a11.0 (1.2)a
MR160.050 (0.006)a3.36 (0.04)b0.345 (0.001)a0.039 (0.005)a0.0032 (0.0003)a5.7 (0.1)b13.41 (1.69)a12.4 (0.1)a
MR170.06 (0.03)a2.5 (0.1)c0.5 (0.1)a0.043 (0.008)a0.0033 (0.0007)a6.5 (0.2)b15.75 (1.17)a10.4 (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