Table 2.
Lipid class and fatty acid composition of salmon head kidney leukocytes (HKLs) in different dietary groups
| Lipid class % | FO7 | FO5 | p value |
|---|---|---|---|
| Hydrocarbons | 0.76 ± 0.104 | 0.43 ± 0.177 | 0.110 |
| Triacylglycerols | 0.83 ± 0.182 | 1.94 ± 0.641 | 0.124 |
| Free fatty acids | 0.58 ± 0.162 | 1.99 ± 0.442 | 0.012 |
| Sterols | 11.38 ± 0.318 | 12.51 ± 0.371 | 0.032 |
| AMPLa | 5.71 ± 0.787 | 6.06 ± 0.909 | 0.777 |
| Phospholipids | 80.74 ± 0.816 | 76.80 ± 1.695 | 0.044 |
| Fatty acids %b | |||
| 14:0 | 1.17 ± 0.027 | 0.97 ± 0.030 | < 0.0001 |
| 15:0 | 0.24 ± 0.003 | 0.22 ± 0.005 | 0.001 |
| 16:0 | 18.28 ± 0.189 | 17.96 ± 0.245 | 0.314 |
| 16:1n-7 | 0.77 ± 0.032 | 0.73 ± 0.050 | 0.473 |
| 17:0 | 0.21 ± 0.004 | 0.21 ± 0.005 | 0.200 |
| 16:4n-1 | 2.19 ± 0.289 | 2.08 ± 0.356 | 0.814 |
| 18:0 | 6.36 ± 0.110 | 6.45 ± 0.149 | 0.621 |
| 18:1n-9 | 17.08 ± 0.337 | 17.81 ± 0.349 | 0.151 |
| 18:1n-7 | 3.15 ± 0.031 | 3.16 ± 0.043 | 0.840 |
| 18:2n-6 | 4.58 ± 0.084 | 4.93 ± 0.142 | 0.041 |
| 18:3n-6 | 0.20 ± 0.005 | 0.27 ± 0.011 | < 0.0001 |
| 18:3n-3 | 0.76 ± 0.025 | 0.79 ± 0.038 | 0.568 |
| 18:4n-3 | 0.26 ± 0.008 | 0.30 ± 0.023 | 0.073 |
| 20:1n-9 | 1.14 ± 0.037 | 0.98 ± 0.036 | 0.005 |
| 20:2n-6 | 0.63 ± 0.020 | 0.63 ± 0.030 | 0.922 |
| 20:3n-6 | 1.57 ± 0.046 | 1.88 ± 0.078 | 0.003 |
| 20:4n-6 | 5.23 ± 0.152 | 5.67 ± 0.190 | 0.080 |
| 20:4n-3 | 0.56 ± 0.017 | 0.55 ± 0.018 | 0.739 |
| 20:5n-3 | 6.37 ± 0.150 | 5.77 ± 0.131 | 0.008 |
| 22:1n-11(13) | 0.24 ± 0.024 | 0.32 ± 0.062 | 0.232 |
| 22:1n-9 | 0.27 ± 0.051 | 0.46 ± 0.112 | 0.131 |
| 22:5n-3 | 0.74 ± 0.027 | 0.69 ± 0.023 | 0.245 |
| 22:6n-3 | 23.74 ± 0.448 | 23.00 ± 0.473 | 0.271 |
| 24:1 | 0.72 ± 0.024 | 0.74 ± 0.029 | 0.450 |
| Bacterial | 1.14 ± 0.047 | 1.05 ± 0.049 | 0.196 |
| Σ SFAc | 26.41 ± 0.298 | 25.94 ± 0.399 | 0.346 |
| Σ MUFAd | 24.48 ± 0.397 | 25.25 ± 0.482 | 0.229 |
| Σ PUFAe | 48.53 ± 0.594 | 48.28 ± 0.624 | 0.774 |
| Σ LC n-3f | 31.58 ± 0.551 | 30.16 ± 0.531 | 0.080 |
| Σ LC n-6 | 7.68 ± 0.171 | 8.47 ± 0.226 | 0.012 |
| LCn-6/ LCn-3 | 0.24 ± 0.005 | 0.28 ± 0.007 | 0.001 |
| P/S | 1.84 ± 0.040 | 1.87 ± 0.047 | 0.662 |
| Σ n-3 | 33.43 ± 0.583 | 32.13 ± 0.449 | 0.098 |
| DHA/EPA ratio | 3.74 ± 0.087 | 4.00 ± 0.102 | 0.068 |
Values are mean ± SE. Bold p values indicate a significant (p < 0.05) difference between groups
aAcetone mobile polar lipids
bData are expressed as area percentage of identified FAME (fatty acid methyl ester), for fatty acids that were present at ≥0.2% of the total
cSaturated fatty acid
dMonounsaturated fatty acid
ePolyunsaturated fatty acid
fLong chain n-3
Other fatty acids present at <0.2%: 15:0, i16:0, 16:1n-5, i17:0, ai17:0, 16:2n-4, 17:1, 18:2n-4, 18:3n-4, 20:0, 20:3n-3, 22:0, 22:5n-6