Factors | Variables | Low level (− 1) | High level (+ 1) | Coefficient | SS | F-Value | P-value |
---|---|---|---|---|---|---|---|
Inoculation amount (%) | X1 | 2 | 2.5 | −4.20 | 211.51 | 0.60 | 0.4746 |
Medium capacity (%) | X2 | 16 | 20 | 14.19 | 2415.71 | 6.82 | 0.0476 |
Initial pH | X3 | 5.5 | 7.0 | 4.93 | 292.25 | 0.83 | 0.4054 |
Culture temperature (°C) | X4 | 22 | 28 | 31.31 | 11,760.04 | 33.20 | 0.0022 |
Rotation speed (r min−1) | X5 | 150 | 200 | −0.71 | 6.08 | 0.017 | 0.9009 |
Fermentation time (h) | X6 | 36 | 48 | 36.41 | 15,909.71 | 44.92 | 0.0011 |