Table 3 Orthogonal test results and analysis
Factor level | A Temperature (℃) | B Inoculation amount (%) | C Time (d) | D pH | Vacant column | Butyric acid (g/L) |
|---|---|---|---|---|---|---|
1 | 26 | 2.5 | 6 | 6.5 | 1 | 10.33 ± 0.23 |
2 | 26 | 5 | 7 | 7 | 2 | 10.94 ± 0.33 |
3 | 26 | 7.5 | 8 | 7.5 | 3 | 11.24 ± 0.27 |
4 | 26 | 10 | 9 | 8 | 4 | 11.04 ± 0.43 |
5 | 29 | 2.5 | 7 | 7.5 | 4 | 11.81 ± 0.26 |
6 | 29 | 5 | 6 | 8 | 3 | 12.47 ± 0.32 |
7 | 29 | 7.5 | 9 | 6.5 | 2 | 12.98 ± 0.36 |
8 | 29 | 10 | 8 | 7 | 1 | 13.24 ± 0.64 |
9 | 32 | 2.5 | 8 | 8 | 2 | 11.88 ± 0.63 |
10 | 32 | 5 | 9 | 7.5 | 1 | 12.83 ± 0.63 |
11 | 32 | 7.5 | 6 | 7 | 4 | 12.97 ± 0.25 |
12 | 32 | 10 | 7 | 6.5 | 3 | 11.38 ± 0.21 |
13 | 35 | 2.5 | 9 | 7 | 3 | 13.80 ± 0.73 |
14 | 35 | 5 | 8 | 6.5 | 4 | 13.77 ± 0.64 |
15 | 35 | 7.5 | 7 | 8 | 1 | 12.86 ± 0.53 |
16 | 35 | 10 | 6 | 7.5 | 2 | 13.55 ± 0.29 |
K1 | 10.887 | 11.955 | 12.330 | 12.115 | 12.315 | |
K2 | 12.625 | 12.503 | 11.748 | 12.738 | 12.338 | |
K3 | 12.625 | 12.512 | 12.532 | 12.358 | 12.223 | |
K4 | 13.495 | 12.303 | 12.663 | 12.063 | 12.398 | |
R | 2.608 | 0.557 | 0.915 | 0.675 | 0.175 |