Table 4.
Antioxidant activity of the crude extract and purified fractions of fucoidan from A. nodosum seaweed.
| Sample | Antioxidant Activity | |
|---|---|---|
| DPPH Scavenging Capacity (%) | FRAP (mg TE/g) |
|
| Crude Extract | 43.1 ± 0.2 a | 38.6 ± 0.2 a |
| Solvent Purified Fraction | 37.8 ± 0.5 b | 30.8 ± 0.4 b |
| MWCO Fraction (10 kDa) | 23.1 ± 0.3 c | 14.8 ± 0.5 c |
| SPE Fraction | 22.6 ± 0.1 cd | 14.5 ± 0.3 cd |
| Fucoidan standard (from Sigma) | 21.7 ± 0.6 d | 13.9 ± 0.7 d |
| Ascorbic acid | 35.2 ± 0.8 b | — |
The results are expressed as mean ± standard deviation of the mean (n = 2). Means not sharing the same letter in a column are significantly different (LSD) at p < 0.05 probability level. FRAP: expressed as mg trolox equivalent (TE)/g of dry weight (dw) extract. SPE: solid phase extraction; MWCO: molecular weight cut-off filter.