Table 4.
Effect of pH on growth and ICA production by Y. lipolytica VKM Y-2373.
| Parameter | pH | |||||
|---|---|---|---|---|---|---|
| 3.0 | 4.0 | 5.0 | 6.0 | 6.5 | 7.0 | |
| Biomass (g/L) | 20.0 ± 2.65 | 19.0 ± 3.53 | 21.0 ± 2.25 | 18.30 ± 3.10 | 16.30 ± 2.80 | 14.00 ± 2.65 |
| ICA (g/L) | 20.8 ± 3.85 | 42.4 ± 3.15 | 40.4 ± 3.85 | 80.12 ± 2.00 | 76.3 ± 3.40 | 40.73 ± 2.00 |
| CA (g/L) | 34.7 ± 3.45 | 60.8 ± 3.89 | 67.7 ± 3.45 | 41.00 ± 3.12 | 30.5 ± 2.15 | 26.00 ± 3.12 |
| ICA/CA ratio | 0.6:1 | 0.7:1 | 0.6:1 | 2:1 | 2.5:1 | 2.2:1 |
| Total amount of ICA (P) (g) | 180.00 | 338.40 | 316.80 | 597.60 | 597.60 | 360.00 |
| Glycerol + Fatty acids consumed (S) (g) | 692.00 | 676.00 | 597.00 | 602.05 | 649.56 | 654.00 |
| Y (g/g) | 0.26 | 0.50 | 0.49 | 0.94 | 0.90 | 0.54 |
| Q (g/L·h) | 0.25 | 0.47 | 0.44 | 0.83 | 0.83 | 0.50 |