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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)

From: Filamentous cyanobacteria triples oil production in seawater-based medium supplemented with industrial waste: monosodium glutamate residue

  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
  1. ND not detected
  2. aToxic elements: selenium, vanadium, chromium and lead were lower than detection. All data are averages of biological triplicates ± standard deviation