Table 6.
Fluxes distribution for acetate and acetate + propionate feeding between mixed microbial cultures and Cupriavidus necator
| Feeding | Acetate | Acetate + Propionate | ||||
| Culture enrichment | Acetate | Propionate | Acetate | Propionate | ||
| Cultures | Mixed microbial cultures (This work) | Cupriavidus necator [37] | Mixed microbial cultures (This work) | Cupriavidus necator [18] | ||
| Substrate uptake rate (C-mol/(C-mol.h)) | ||||||
| VFA uptake rate | 0.73 | 0.21 | ≈ 0.441 | 0.67 | 0.45 | ≈ 0.381 |
| Acetate uptake rate | 0.33 | 0.22 | ≈ 0.161 | |||
| Propionate uptake rate | - | - | - | 0.34 | 0.23 | ≈ 0.221 |
| Carbon and oxygen flux distribution (%) | ||||||
| Carbon converted to growth | 0.7 | 3.3 | 15.0 | 2.0 | 3.3 | 8.7 |
| Carbon converted to CO2 | 25.7 | 35.0 | 37.8 | 20.0 | 28.1 | 50.1 |
| Oxygen consumed per carbon | 16.5 | 27.3 | 19.8 | 14.7 | 24.3 | - |
| Carbon converted to PHA | 73.6 | 61.7 | 47.2 | 78.0 | 68.6 | 41.2 |
| Carbon converted to Ac-CoA* | 73.6 | 61.7 | 47.2 | 45.2 | 39.5 | 36.9 |
| Carbon converted to Propionyl-CoA* | - | - | - | 32.8 | 29.1 | 4.3 |
1Approximate rates estimated from experimental results