Table 1.
Effects of initial pH value on fatty acid proportions in the membrane of P. alhagi.
| Fatty Acid Species |
pH 2 (%) | pH 7.0 (%) | pH 9 (%) | pH 12 (%) | pH 13 (%) |
|---|---|---|---|---|---|
| C8:0 | 0.50 ± 0.01 d | 7.53 ± 0.18 c | 5.21 ± 0.18 c | 11.89 ± 0.15 b | 32.09 ± 0.99 a |
| C10:0 | 1.39 ± 0.04 d | 2.80 ± 0.17 b | 0.85 ± 0.02 d | 1.81 ± 0.04 c | 9.56 ± 0.43 a |
| C11:0 | 0.04 ± 0.01 e | 0.84 ± 0.03 b | 0.17 ± 0.02 d | 0.37 ± 0.01 c | 2.08 ± 0.14 a |
| C12:0 | 17.71 ± 0.57 b | 8.72 ± 0.11 c | 8.26 ± 0.03 c | 11.36 ± 0.06 a | 2.65 ± 0.12 d |
| C13:0 | 0.07 ± 0.01 e | 0.48 ± 0.01 d | 0.79 ± 0.01 b | 0.67 ± 0.01 c | 0.99 ± 0.02 a |
| C14:1 | 0.52 ± 0.01 d | 0.70 ± 0.02 d | 1.46 ± 0.10 c | 2.42 ± 0.04 b | 5.35 ± 0.16 a |
| C14:0 | 3.82 ± 0.24 c | 4.44 ± 0.05 c | 4.92 ± 0.05 c | 7.14 ± 0.05 b | 14.48 ± 0.84 a |
| C15:0 | 0.30 ± 0.01 d | 1.02 ± 0.03 b | 0.52 ± 0.01 c | 0.87 ± 0.01 c | 2.32 ± 0.14 a |
| C16:1 | 8.72 ± 0.32 d | 17.6 ± 0.09 b | 16.73 ± 0.08 c | 22.25 ± 0.02 a | 2.42 ± 0.13 e |
| C16:0 | 22.62 ± 0.5 b | 25.45 ± 0.10 a | 26.69 ± 1.90 a | 0.03 ± 0.01 d | 3.92 ± 0.17 c |
| C17:1 | 0.43 ± 0.01 d | 0.65 ± 0.02 c | 0.17 ± 0.01 e | 0.80 ± 0.01 b | 2.16 ± 0.14 a |
| C17:0 | 0.38 ± 0.01 c | 0.29 ± 0.02 c | 0.42 ± 0.02 c | 0.68 ± 0.01 b | 2.41 ± 0.11 a |
| C18:3 | 0.25 ± 0.02 c | 0.79 ± 0.01 a | 0.43 ± 0.01 b | 0.75 ± 0.01 a | 0.78 ± 0.02 a |
| C18:2 | 0.18 ± 0.01 e | 0.53 ± 0.01 c | 0.41 ± 0.01 d | 1.06 ± 0.02 b | 3.01 ± 0.03 a |
| C18:1 | 22.37 ± 0.29 c | 21.25 ± 0.14 d | 25.3 ± 0.05 b | 29.43 ± 0.07 a | 0.99 ± 0.04 e |
| C18:0 | 18.86 ± 0.47 a | 2.81 ± 0.03 d | 2.83 ± 0.13 d | 4.63 ± 0.02 c | 7.18 ± 0.28 b |
| C20:4 | 0.22 ± 0.01 c | 0.59 ± 0.05 b | 0.27 ± 0.02 c | 0.63 ± 0.01 b | 2.57 ± 0.10 a |
| C20:5 | 0.11 ± 0.01 c | 0.61 ± 0.02 b | 0.27 ± 0.01 c | 0.59 ± 0.01 b | 1.33 ± 0.05 a |
| C20:3 | 0.28 ± 0.02 d | 1.49 ± 0.08 a | 0.27 ± 0.01 d | 0.80 ± 0.01 c | 1.09 ± 0.01 b |
| C20:2 | 0.38 ± 0.03 e | 0.85 ± 0.06 c | 0.64 ± 0.02 d | 0.97 ± 0.01 a | 0.90 ± 0.03 b |
| C20:1 | 0.15 ± 0.01 d | 0.22 ± 0.02 d | 0.32 ± 0.01 c | 0.53 ± 0.01 b | 0.73 ± 0.03 a |
| U/S | 0.51 ± 1.01 d | 0.83 ± 0.01 c | 0.91 ± 0.04 b | 1.53 ± 0.01 a | 0.27 ± 0.01 e |
a Numbers are mean ± SD (n = 3). Different superscript letters indicate significant differences in the average of all samples (p < 0.05) within the same row. U/S: the ratio of unsaturated to saturated fatty acids.