Table 2 Calculated parameters of sodium gluconate fermentation by A. niger inoculated with seed culture for three different initial glucose concentrations
Parameters | Fermentations | ||
|---|---|---|---|
F1 | F2 | F3 | |
Initial glucose in seed culture (g/L) | 256 ± 5 | 310 ± 10 | 342 ± 8 |
Initial glucose in fermentation (g/L) | 320 ± 20 | 314 ± 15 | 331 ± 25 |
Initial fermentation osmotic pressure (mOsm/kg) | 2292 ± 30 | 2200 ± 20 | 2340 ± 45 |
Fermentation time (h) | 23 ± 0.5 | 21 ± 0.5 | 28 ± 0.5 |
Maximum total GOD activity (μLO2/h/mL) | 1592 ± 121.53 | 2434 ± 187.31 | 3212 ± 308.47 |
Average rate of glucose consumption (g/L/h) | 13.91 ± 0.54 | 14.95 ± 0.36 | 11.82 ± 0.73 |
Average production rate of sodium gluconate (g/L/h) | 14.42 ± 0.48 | 16.34 ± 0.53 | 12.37 ± 0.51 |
Highest OUR value (mmol/L/h) | 52.76 ± 1.21 | 62.34 ± 2.17 | 40.47 ± 2.43 |
Yield (g/g) | 1.103 ± 0.05 | 1.198 ± 0.04 | 1.076 ± 0.09 |