Table 5 Effects of pH regulators on final broth pH, cell growth and SL production
pH regulator | Final pH | Residual glu (g/L) | Biomass (g/L) | Total SL (g/L) | Lactonic SL (g/L) | Lac SL/tot SL (%) |
|---|---|---|---|---|---|---|
Control group | 2.55 | 0.81 ± 0.08 | 6.53 ± 0.14 | 40.74 ± 1.60 | 18.83 ± 0.01 | 46.22 |
NaOH | 4.56 | 0.81 ± 0.01 | 9.65 ± 0.01 | 38.89 ± 1.09 | 14.91 ± 0.52 | 38.33 |
K2CO3 | 5.62 | 2.40 ± 0.14 | 5.72 ± 0.39 | 38.27 ± 4.03 | 8.14 ± 3.46 | 21.27 |
CaO | 5.71 | 0.29 ± 0.02 | 9.92 ± 1.01 | 40.69 ± 0.88 | 11.96 ± 4.46 | 29.38 |
AlCl3 | 3.89 | 0.20 ± 0.02 | 7.05 ± 0.12 | 50.09 ± 3.64 | 23.58 ± 4.79 | 47.08 |
C6H8O7 | 4.18 | 0.17 ± 0.02 | 9.21 ± 0.08 | 41.01 ± 0.48 | 20.03 ± 2.56 | 48.84 |
Na3C6H5O7·2H2O | 4.48 | 0.24 ± 0.00 | 5.87 ± 0.08 | 39.52 ± 1.96 | 16.13 ± 0.79 | 40.81 |