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Table 2 IC50 values in free radical scavenging assays for extracts of P. tetrastromatica, C. racemosa and T. ornata

From: Antioxidant and cytotoxic activities of three species of tropical seaweeds

  P. tetrastromatica C. racemosa T. ornata Quercetin Rutin Catechin
Total phenolic content (mg GAE/g) 69.5 ± 1.74 (Methanol extract) 19.8 ± 2.01 (Methanol extract) 71.3 ± 2.14 (Acetone extract) - - -
Total flavonoid content (mg of catechin equivalents/g dried weight) 38.4 ± 1.64 (Methanol extract) 16.0 ± 0.52 (EA extract) 17.5 ± 1.06 (Hexane extract) - - -
IC50 of DPPH radical scavenging activity (μg/mL) 171.67 ± 2.89 (EA extract) 90.00 ± 0 (Hexane extract) 280.67 ± 1.15 (Methanol extract) 21.67 ± 2.89 23.33 ± 2.89 -
IC50 of superoxide anion scavenging activity (μg/mL) ND ND 20.00 ± 0 (EA, acetone, methanol extracts) 260.00 ± 0 223.33 ± 2.89 -
IC50 of nitric oxide scavenging activity (μg/mL) ND 38.33 ± 2.89 (DCM extract) 25.00 ± 0 (DCM and acetone extracts) 20.00 ± 0 20.00 ± 0 -
IC50 of hydroxyl radical scavenging activity (μg/mL) 23.33 ± 2.89 (Hexane extract) 20.00 ± 0 (Hexane and acetone extracts) 20.00 ± 0 (Methanol extract) 20.00 ± 0 101.67 ± 2.89 -
  1. Quercetin and rutin were used as positive controls for all scavenging assays and for the determination of TPC whereas catechin was used as a positive control for the determination of TFC. Each value is expressed as mean ± SD (n = 3). Extracts in parentheses () indicate the solvent extracts with the highest TPC and TFC contents and best radical scavenging activities
  2. ND Not detected