Table 1.
Total phenolic and carotenoid contents and antioxidant activity of algae extracts prepared with different water to ethanol ratios.
| Algae Species | W/EtOH | TPC | TCC | FRAP | DPPH |
|---|---|---|---|---|---|
| Crassiphycus corneus | 100/0 | 1.38 ± 0.01 B,b | 1.63 ± 0.08 B,a | 3.90 ± 0.49 A,a | 9.4 ± 0.61 B,a |
| 70/30 | 0.98 ± 0.03 A,a | 2.08 ± 001 B,b | 3.51 ± 0.06 A,a | 21.55 ± 0.05 C,c | |
| 50/50 | 0.97 ± 0.03 A,a | 2.49 ± 0.03 C,c | 4.34 ± 0.42 A,b | 19.02 ± 0.71 C,b | |
| 20/80 | 1.12 ± 0.02 A,b | 3.46 ± 0.08 D,d | 4.14 ± 0.29 A,b | 23.5 ± 0.9 D,d | |
| Ulva ohnoi | 100/0 | 1.18 ± 0.18 A,b | 1.16 ± 0.09 A,a | 8.37 ± 0.06 C,a | 4.14 ± 0.16 A,c |
| 70/30 | 1.08 ± 0.02 B,a | 1.41 ± 0.09 A,b | 8.83 ± 0.13 B,b | 4.56 ± 0.34 A,c | |
| 50/50 | 1.08 ± 0.03 B,a | 1.68 ± 0.06 B,c | 8.62 ± 0.06 C,b | 3.56 ± 0.30 A,b | |
| 20/80 | 1.42 ± 0.15 B,b | 1.86 ± 0.15 B,c | 16.52 ± 0.18 C,c | 3.05 ± 0.08 A,a | |
| Artrhospira platensis | 100/0 | 3.22 ± 0.07 D,c | 1.62 ± 0.36 B | 13.93 ± 0.02 D,b | 9.82 ± 0.40 B,c |
| 70/30 | 1.85 ± 0.02 C,b | 1.32 ± 0.03 A | 13.13 ± 0.01 C,b | 8.43 ± 0.29 B,b | |
| 50/50 | 1.37 ± 0.01 C,a | 1.50 ± 0.01 A | 6.13 ± 0.66 B,a | 5.37 ± 0.05 B,a | |
| 20/80 | 1.40 ± 0.02 B,a | 1.57 ± 0.04 A | 6.55 ± 0.61 B,a | 5.16 ± 0.04 B,a | |
| Haematococcus pluvialis | 100/0 | 1.64 ± 0.03 C | 2.06 ± 0.02 C,a | 6.40 ± 0.18 B,a | 13.66 ± 0.15 C,a |
| 70/30 | 1.62 ± 0.02 C | 2.23 ± 0.21 C,b | 6.53 ± 0.22 B | 13.58 ± 0.17 C | |
| 50/50 | 1.67 ± 0.01 C | 2.44 ± 0.15 C,c | 6.64 ± 0.34 B | 13.22 ± 0.31 C | |
| 20/80 | 1.69 ± 0.07 C | 2.52 ± 0.03 C,b | 6.65 ± 0.22 B,b | 14.61 ± 0.11 C,b |
W/EtOH: water to ethanol ratio in solvents. TPC: total phenolic content of extracts, expressed as mg of gallic acid equivalents per g. TCC: total carotenoid content of extracts, expressed as μmol equivalents Trolox per g. FRAP: ferric reducing antioxidant power, expressed as μmol equivalent of Trolox per g. DPPH: radical scavenging activity, expressed as μmol equivalents Trolox per g. Superscript uppercase letters indicate differences attributable to algae species for the same water/ethanol proportion. Superscript lowercase letters indicate differences attributable to water/ethanol proportion for the same algal species. Values are mean ± sd on dry weight basis.