Table 2.
Elemental composition (DCM basis) of Spirulina subsalsa cultivated in mZM and seawater supplemented with MSGR in different volume ratios (1/1000, 1/500, 1/200, 1/100 and 1/50, VMSGR/Vseawater)
| 1/1000 | 1/500 | 1/200 | 1/100 | 1/50 | mZM | |
|---|---|---|---|---|---|---|
| Minerals (%) | ||||||
| Calcium | 1.14 ± 0.01 | 3.06 ± 0.04 | 4.58 ± 0.03 | 2.92 ± 0.01 | 3.53 ± 0.02 | 1.00 ± 0.02 |
| Magnesium | 2.92 ± 0.11 | 0.95 ± 0.07 | 0.61 ± 0.04 | 1.30 ± 0.08 | 0.71 ± 0.05 | 1.32 ± 0.19 |
| Phosphorus | 0.04 ± 0.00 | 0.10 ± 0.01 | 0.18 ± 0.02 | 0.31 ± 0.06 | 0.60 ± 0.08 | 0.85 ± 0.03 |
| Potassium | 0.75 ± 0.03 | 0.56 ± 0.02 | 0.54 ± 0.02 | 2.43 ± 0.08 | 0.34 ± 0.01 | 1.58 ± 0.04 |
| Sodium | 3.35 ± 0.08 | 4.08 ± 0.15 | 2.32 ± 0.05 | 0.04 ± 0.01 | 2.07 ± 0.12 | 3.64 ± 0.03 |
| Trace elements (µg/g) | ||||||
| Cobalt | ND | 4.4 ± 0.1 | 6.7 ± 0.2 | ND | 7.9 ± 0.1 | 2.9 ± 0.0 |
| Copper | 77.4 ± 3.8 | 27.1 ± 1.2 | 32.5 ± 1.5 | 96.1 ± 3.6 | 60.1 ± 4.4 | 35.7 ± 2.1 |
| Iron | 288.8 ± 4.6 | 393.3 ± 2.8 | 713.9 ± 12.1 | 1215.7 ± 28.6 | 454.8 ± 8.2 | 1051.3 ± 12.8 |
| Manganese | 11.2 ± 0.2 | 42.7 ± 1.4 | 49.7 ± 0.4 | 38.6 ± 0.6 | 17.5 ± 0.8 | 122.2 ± 3.5 |
| Zinc | 356.4 ± 6.7 | 852.1 ± 15.5 | 1169.0 ± 18.9 | 622.3 ± 4.8 | 1081.3 ± 12.9 | 23.9 ± 0.6 |
| Toxins (µg/g)a | ||||||
| Cadmium | 0.09 ± 0.01 | 0.06 ± 0.01 | 0.07 ± 0.00 | ND | 0.19 ± 0.02 | ND |
| Na/K | 4.51 ± 0.11 | 7.18 ± 0.23 | 4.29 ± 0.17 | 0.02 ± 0.00 | 5.99 ± 0.08 | 2.43 ± 0.06 |
| Ca/P | 28.50 ± 0.25 | 27.82 ± 1.78 | 25.33 ± 1.71 | 7.89 ± 0.88 | 5.46 ± 0.24 | 1.2 ± 0.06 |
ND not detected
aToxic elements: selenium, vanadium, chromium and lead were lower than detection. All data are averages of biological triplicates ± standard deviation