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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