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. 2019 Aug 2;24(15):2825. doi: 10.3390/molecules24152825

Table 2.

Antioxidant activity of essential oils (EOs) of peppermint, native spearmint, and Scotch spearmint, measured by chemical-based antioxidant activities assays.

Assay 1 EC50, mg/mL
Peppermint EO Native Spearmint EO Scotch Spearmint EO
DPPH scavenging capacity 70.29 ± 4.59 c 86.51 ± 5.45 b 109.8 ± 6.70 a
TEAC assay 29.51 ± 1.30 b 45.74 ± 1.71 a 44.38 ± 1.67 a
Reducing power assay 22.7 ± 1.66 23.39 ± 2.66 22.91 ± 2.35

a,b,c Within a row, means without a common superscript letter are different (p < 0.05). Data are least squares means of 6 observations per treatment. 1 TEAC = Trolox equivalent antioxidant capacity, FRAP = ferric reducing antioxidant power, EC50 = half maximal effective concentration, DPPH = 2,2-diphenyl-1-picrylhydrazyl.