Table 3.
Content in total phenolic compounds (TPC) and antioxidant activity (IC50) of methanol extracts of U. rigida, Gracilaria sp. and F. vesiculosus dried in different conditions.
| Drying Condition | U. rigida | Gracilaria sp. | F. vesiculosus | |||
|---|---|---|---|---|---|---|
| TPC | IC50 | TPC | IC50 | TPC | IC50 | |
| C | 0.93 ± 0.13 a | 0.47 ± 0.15 a | 1.39 ± 0.48 b | 0.80 ± 0.09 b | 11.0 ± 0.28 d | 0.06 ± 0.01 d |
| 25 | 1.24 ± 0.31 a | 0.34 ± 0.17 a | 1.46 ± 0.42 b | 0.79 ± 0.13 b | 6.72 ± 1.41 e | 0.09 ± 0.02 d |
| 40 | 0.96 ± 0.32 a | 0.43 ± 0.08 a | 1.24 ± 0.43 b | 1.70 ± 0.53 c | 7.28 ± 1.35 e | 0.09 ± 0.01 d |
| 60 | 0.74 ± 0.13 a | 0.31 ± 0.06 a | 1.11 ± 0.34 b | 1.89 ± 0.72 c | 7.20 ± 0.45 e | 0.09 ± 0.06 d |
C (freeze-dried), 25 (dried at 25 °C), 40 (dried at 40 °C), 60 (dried at 60 °C); TPC expressed in mg equivalents of gallic acid (EGA)/g of seaweed; IC50 represents the extract concentration that is required for scavenging 50% of ABTS radical (in mg of dry matter/mL of extract); Values are presented as mean ± standard deviation. Different letters (a,b,c,d,e) in the same column indicate significant differences (p < 0.05) according to Tukey’s test.