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Table 2 Comparison of the antioxidant and free radical scavenging capacities of 70% methanol extract of E. tuba and standard reference compounds

From: Assessment of the phytochemical constituents and antioxidant activity of a bloom forming microalgae Euglena tuba

Name of assay ETME Standard Values of standard compounds
TEAC Values 0.202 ± 0.001 - -
*IC50 values of the extracts for free radical scavenging capacity for
DPPH 146.07 ± 1.80 Ascorbic acid 5.29 ± 0.28***
Hydroxyl radical (OH) scavenging 41.89 ± 0.41 Mannitol 571.45 ± 20.12***
Lipid peroxidation 202.49 ± 33.32 Trolox 6.76 ± 0.17***
Superoxide anion (O2•-) scavenging 5.83 ± 0.07 Quercetin 42.06 ± 1.35***
Hydrogen peroxide (H2O2) scavenging 47.34 ± 5.05 Sodium pyruvate 3.24 ± 0.30***
Nitric oxide radical (NO) scavenging 278.46 ± 15.02 Curcumin 90.82 ± 4.75***
Peroxynitrite (ONOO-) scavenging 2.821 ± 1.69 Gallic acid 0.876 ± 0.57***
Singlet oxygen (1O2) scavenging 0.879 ± 0.29 Lipoic acid 0.046 ± 0.01***
Hypochlorous acid (HOCl) scavenging 223.25 ± 4.19 Ascorbic acid 235.96 ± 5.75**
  1. *IC50 Values are in μg/ml (except for Hydrogen peroxide, Peroxynitrite and Singlet oxygen scavenging assay where values are expressed in mg/ml). Each value represents mean ± S.D. (n = 6). ***p < 0.001, **p < 0.01 vs ETME.