Table 3 Yield and metals composition of brown and red strains from K. alvarezii before and after treatment with 6 % (w/v) KOH and subsequently extracted with hot water (carrageenan and residue production)
Samples | Strains | Yield of sample (g/100 g of material) (%) | Potassium (mg g−1) | Calcium (mg g−1) | Sodium (mg g−1) |
|---|---|---|---|---|---|
Components of samples (mg g −1 on pulp basic) | |||||
Untreated | Brown | 100 | 30.5 ± 0.01 | 2.7 ± 0.01 | 5.1 ± 0.01 |
Treated with KOH | 89.3 ± 0.9 | 42.7 ± 0.01 | 3.4 ± 0.01 | 1.5 ± 0.08 | |
Residue | 23.0 ± 0.5 | 22.3 ± 0.07 | 3.8 ± 0.06 | 2.3 ± 0.04 | |
Carrageenan | 63.5 ± 0.6 | 53.5 ± 0.01 | 2.7 ± 0.01 | 1.2 ± 0.01 | |
Untreated | Red | 100 | 28.6 ± 0.01 | 3.3 ± 0.02 | 4.3 ± 0.05 |
Treated with KOH | 89.5 ± 0.5 | 36.5 ± 0.02 | 2.7 ± 0.01 | 1.3 ± 0.04 | |
Residue | 27.8 ± 1.2 | 18.2 ± 0.04 | 4.0 ± 0.01 | 2.0 ± 0.06 | |
Carrageenan | 60.0 ± 1.5 | 48.6 ± 0.02 | 2.6 ± 0.01 | 1.2 ± 0.01 | |
Commercial carrageenan | – | – | 72.8 ± 0.3 | 25.8 ± 0.2 | 8.6 ± 0.1 |
Components of samples (mg g −1 of original material) | |||||
Untreated | Brown | 100 | 30.5 ± 0.01 | 2.7 ± 0.01 | 5.1 ± 0.01 |
Treated with KOH | 89.3 ± 0.9 | 38.1 ± 0.01 | 3.0 ± 0.01 | 1.3 ± 0.08 | |
Residue | 23.0 ± 0.5 | 5.1 ± 0.07 | 0.9 ± 0.06 | 0.5 ± 0.04 | |
Carrageenan | 63.5 ± 0.6 | 34.0 ± 0.01 | 1.7 ± 0.01 | 0.8 ± 0.01 | |
Untreated | Red | 100 | 28.6 ± 0.01 | 3.3 ± 0.02 | 4.3 ± 0.05 |
Treated with KOH | 89.5 ± 0.5 | 32.7 ± 0.02 | 2.4 ± 0.01 | 1.2 ± 0.04 | |
Residue | 27.8 ± 1.2 | 5.0 ± 0.04 | 1.1 ± 0.01 | 0.5 ± 0.06 | |
Carrageenan | 60.0 ± 1.5 | 29.1 ± 0.02 | 1.5 ± 0.01 | 0.7 ± 0.01 | |