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Table 2 Comparison of the antioxidant and free radical scavenging capacities of 70% methanolic crudes of Terminalia chebula, Terminalia belerica and Emblica officinalis

From: Comparative study of the antioxidant and reactive oxygen species scavenging properties in the extracts of the fruits of Terminalia chebula, Terminalia belerica and Emblica officinalis

Name of Assay 70% methanolic crudes of Standard Values of Standard compounds
  Terminalia chebula Terminalia belerica Emblica officinalis   
TEAC Values 4.52 ± 0.12 1.01 ± 0.03 4.10 ± 0.17 -- --
† Phenolic content 127.60 ± 0.001 133.00 ± 0.003 215.60 ± 0.004 -- --
‡ Flavonoid content 219.30 ± 0.01 138.30 ± 0.01 176.00 ± 0.01 -- --
§ Ascorbic acid content 46.74 ± 1.10 45.25 ± 0.75 71.08 ± 1.63 -- --
♣ IC50 values of the extracts for free radical scavenging capacity for:
DPPH 1.73 ± 0.07*** 1.45 ± 0.02*** 1.43 ± 0.03*** Ascorbic acid 5.29 ± 0.28
Hydroxyl (OH.) 72.02 ± 8.99*** 203.25 ± 1.87** 382.02 ± 7.88*** Mannitol 571.45 ± 20.12
Superoxide (O2 .-) 13.42 ± 0.22*** 18.18 ± 1.39*** 13.82 ± 0.19*** Quercetin 42.06 ± 1.35
Nitric oxide (NO.) 33.28 ± 4.56*** 40.83 ± 4.40*** 33.89 ± 2.94*** Curcumin 90.82 ± 4.75
Peroxynitrite (ONOO.-) 1.27 ± 0.07*** 0.99 ± 0.10** 0.83 ± 0.03NS Gallic acid 0.88 ± 0.06
Singlet oxygen (1O2) 424.50 ± 24.70*** 233.12 ± 48.68*** 490.42 ± 159.59** Lipoic acid 46.15 ± 1.16
Hypochlorous acid (HOCl) 433.60 ± 15.45** 271.51 ± 13.70** 420.58 ± 31.97*** Ascorbic acid 235.96 ± 5.75
  1. † Phenolic content (mg/ml Gallic acid equivalent per 100 mg plant extract)
  2. ‡ Flavonoid content (mg/ml Quercetin equivalent per 100 mg plant extract)
  3. § Ascorbic acid content (mg/ml Ascorbic acid per 100 mg plant extract)
  4. ♣ IC50 Values are in μg/ml (except for Peroxynitrite scavenging assay where values are expressed in mg/ml). Each value represents mean ± S.D. (n = 6)
  5. * p < 0.05; ** p < 0.01;*** p < 0.001; NS = Non significant