Table 4.
Major fatty acid (FA) components in microalgae extracts from different extraction profiles, expressed as percentage of the total lipid extract (mean ± standard deviation)
| S. obliquus | S. obtusiusculus | |||||||
|---|---|---|---|---|---|---|---|---|
| Profile | 1 | 2 | 3 | 4 | 5 | 4 | ||
| Pressure (MPa) | 7 | 7 | 12 | 12 | 12 | 15 | 15 | 12 |
| CO2: biomass ratio | 20 | 100 | 20 | 100 | 100 | 100 | 100 | 100 |
| C14 | 0.29 ± 0.01 | 0.27 ± 0.02 | 0.27 ± 0.01 | 0.29 ± 0.01 | 0.30 ± 0.01 | 0.29 ± 0.02 | 0.29 ± 0.02 | 0.16 ± 0.00 |
| C16 | 6.30 ± 0.19 | 6.38 ± 0.09 | 6.46 ± 0.22 | 6.01 ± 0.05 | 5.68 ± 0.03 | 6.56 ± 0.09 | 6.07 ± 0.02 | 3.25 ± 0.05 |
| C16:1 cis ω7 | 0.72 ± 0.02 | 0.72 ± 0.01 | 0.74 ± 0.03 | 0.74 ± 0.03 | 0.78 ± 0.02 | 0.77 ± 0.01 | 0.77 ± 0.01 | 0.45 ± 0.01 |
| C16:1 ω9 | 1.40 ± 0.06 | 1.83 ± 0.02 | 1.53 ± 0.05 | 2.16 ± 0.03 | 2.03 ± 0.02 | 2.01 ± 0.00 | 1.89 ± 0.01 | 0.41 ± 0.03 |
| C16:2 ω6 | 1.24 ± 0.04 | 1.31 ± 0.02 | 1.27 ± 0.04 | 1.43 ± 0.02 | 1.48 ± 0.07 | 1.44 ± 0.02 | 1.41 ± 0.01 | 0.71 ± 0.01 |
| C16:3 ω3 | 2.31 ± 0.09 | 2.54 ± 0.02 | 2.28 ± 0.04 | 2.77 ± 0.03 | 2.77 ± 0.03 | 2.72 ± 0.02 | 2.70 ± 0.01 | 1.13 ± 0.02 |
| C16:4 ω3 | 9.81 ± 0.33 | 11.93 ± 0.02 | 9.56 ± 0.55 | 13.25 ± 0.09 | 13.28 ± 0.44 | 12.66 ± 0.23 | 12.53 ± 0.16 | 3.91 ± 0.07 |
| C18 | 0.13 ± 0.00 | 0.15 ± 0.00 | 0.14 ± 0.00 | 0.16 ± 0.00 | 0.15 ± 0.01 | 0.15 ± 0.00 | 0.14 ± 0.00 | 0.17 ± 0.01 |
| C18:1 ω9 | 6.59 ± 0.14 | 7.02 ± 0.08 | 6.93 ± 0.23 | 7.43 ± 0.08 | 7.45 ± 0.07 | 7.24 ± 0.09 | 7.25 ± 0.07 | 4.09 ± 0.03 |
| C18:1 ω7 | 1.20 ± 0.02 | 1.28 ± 0.01 | 1.25 ± 0.04 | 1.38 ± 0.04 | 1.38 ± 0.01 | 1.34 ± 0.02 | 1.34 ± 0.03 | 0.79 ± 0.00 |
| C18:2 ω6 | 9.04 ± 0.18 | 9.75 ± 0.11 | 9.18 ± 0.05 | 10.20 ± 0.07 | 10.21 ± 0.08 | 9.94 ± 0.15 | 9.94 ± 0.10 | 6.93 ± 0.07 |
| C18:3 ω3 | 24.78 ± 0.44 | 27.44 ± 0.24 | 24.75 ± 0.59 | 28.12 ± 0.16 | 28.44 ± 0.28 | 27.69 ± 0.35 | 27.75 ± 0.07 | 20.62 ± 0.29 |
| C18:4 ω3 | 2.26 ± 0.09 | 2.81 ± 0.02 | 2.25 ± 0.12 | 3.02 ± 0.03 | 3.07 ± 0.01 | 2.96 ± 0.05 | 2.95 ± 0.01 | 0.88v ± 0.02 |
| C20 | ND | ND | ND | 0.03 ± 0.04 | 0.02 ± 0.00 | 0.02 ± 0.00 | ND | ND |
| C20:1 ω9 | 0.05 ± 0.04 | 0.10 ± 0.01 | 0.05 ± 0.04 | 0.08 ± 0.00 | 0.08 ± 0.01 | 0.08 ± 0.01 | 0.10 ± 0.01 | ND |
| FA yield | 65.72 ± 1.58 | 73.53 ± 0.37 | 66.66 ± 0.83 | 77.07 ± 0.48 | 77.09 ± 0.87 | 75.87 ± 0.59 | 75.11 ± 0.09 | 43.52 ± 0.52 |
All extractions were carried out at 20 °C
FA yield percentage of FAs from total lipids, ND not detectable