Table 2. pH Value in Fermentation Broth with Different Ratios of SDF Substrates and at the Different Time Points of the In Vitro Fermentationa.
| item | SDF 0% | SDF 25% | SDF 50% | SDF 75% | SDF 100% | P value |
|---|---|---|---|---|---|---|
| 4 h | 7.84 ± 0.04b | 7.70 ± 0.07bc | 7.82 ± 0.08bc | 7.76 ± 0.01bc | 7.56 ± 0.05c | 0.04 |
| 8 h | 7.84 ± 0.04b | 7.68 ± 0.07bc | 7.78 ± 0.05b | 7.75 ± 0.01b | 7.53 ± 0.05c | 0.01 |
| 12 h | 7.84 ± 0.04b | 7.63 ± 0.08bc | 7.71 ± 0.04bc | 7.65 ± 0.01bc | 7.48 ± 0.06c | 0.01 |
| 16 h | 7.83 ± 0.04b | 7.42 ± 0.11cd | 7.54 ± 0.05c | 7.08 ± 0.03e | 7.22 ± 0.05de | <0.01 |
| 24 h | 7.79 ± 0.03b | 7.14 ± 0.11c | 6.41 ± 0.09d | 6.33 ± 0.05e | 6.21 ± 0.24de | <0.01 |
| 32 h | 7.79 ± 0.06b | 7.11 ± 0.10c | 6.55 ± 0.06d | 6.12 ± 0.10e | 5.45 ± 0.02f | <0.01 |
| 40 h | 7.78 ± 0.05b | 7.14 ± 0.11bc | 6.62 ± 0.01c | 6.46 ± 0.10c | 5.54 ± 0.30d | <0.01 |
| 48 h | 7.76 ± 0.06b | 7.15 ± 0.13c | 6.68 ± 0.02d | 6.57 ± 0.10d | 5.59 ± 0.13e | <0.01 |
a
Data are presented as mean ± SEM (n = 6), and values in the same row with different letter superscripts (b–f) means a significant difference (P < 0.05). SDF 0% means SDF/IDF = 0:1; SDF 25% means SDF/IDF = 1:3; SDF 50% means SDF/IDF = 1:1; SDF 75% means SDF/IDF = 3:1; and SDF 100% means SDF/IDF = 1:0.