Table 2.
Parameters of fed-batch erythritol biosynthesis by Y. lipolytica Wratislavia K1 on pure glycerol media with and without Span 20 addition.
| Surfactants | NaCl (%) | Initial osmotic pressure (Osm kg−1) | Osmotic pressure after 24 h (Osm kg−1) | Osmotic pressure after 24 h and addition of glycerol (Osm kg−1) | aQER (g L−1 h−1) | bYER (g g−1) |
|---|---|---|---|---|---|---|
| Control I | 0 | 1.8 | 0.9 | 3.0 | 1.17 | 0.39 |
| Span 20 | 0 | 1.8 | 1.1 | 3.2 | 1.29 | 0.42 |
| Control II | 2.5 | 2.5 | 2.1 | 4.4 | 0.82 | 0.40 |
| Span 20 | 2.5 | 2.5 | 2.2 | 4.3 | 1.10 | 0.47 |
a
The volumetric erythritol production rate (QERY).
b
The yield of erythritol production from glycerol (YERY).