Table 4 Effects of yeast extract concentration on final broth pH, cell growth and SL production
YE content (w/w, %) | 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 |
0.00 | 4.35 | 1.77 ± 0.01 | 3.07 ± 0.78 | 41.53 ± 3.62 | 10.03 ± 0.84 | 24.15 |
0.05 | 4.03 | 0.24 ± 0.04 | 3.55 ± 0.02 | 49.66 ± 0.99 | 22.32 ± 2.37 | 44.94 |
0.10 | 4.16 | 0.14 ± 0.11 | 4.47 ± 0.28 | 51.42 ± 0.92 | 21.60 ± 0.43 | 42.01 |
0.15 | 4.40 | 0.03 ± 0.00 | 4.65 ± 0.35 | 53.70 ± 2.61 | 22.06 ± 5.33 | 41.08 |
0.20 | 4.46 | 0.08 ± 0.06 | 5.64 ± 0.13 | 50.09 ± 5.92 | 20.57 ± 1.77 | 41.06 |
0.25 | 4.66 | 0.18 ± 0.04 | 6.88 ± 0.46 | 46.05 ± 4.30 | 20.12 ± 1.34 | 43.70 |
0.30 | 4.77 | 0.18 ± 0.00 | 7.32 ± 0.46 | 45.83 ± 2.00 | 18.12 ± 0.48 | 39.53 |