Table 6 Fermentation kinetics of S. cerevisiae NGY10 in various fermentation media
S. no. | Kinetic parameters | Synthetic media containing glucose | Acid-pretreated rice straw hydrolysate | Alkali-pretreated rice straw hydrolysate | |||
|---|---|---|---|---|---|---|---|
30 °C | 40 °C | 30 °C | 40 °C | 30 °C | 40 °C | ||
1. | Initial sugar (St) (g/l) | 100 | 100 | 26.38 | 26.38 | 17.15 | 17.15 |
2. | Residual sugar (St) (g/l) | 3.82 | 3.64 | 0.433 | 0.551 | 0.71 | 1.832 |
3. | Sugar consumption rate (QS) (g/l/h) | 6.412 | 5.353 | 1.47 | 1.22 | 0.913 | 0.765 |
4. | Sugar consumed (%) | 96.18 | 96.36 | 100 | 99.449 | 99.29 | 98.167 |
5. | Fermentation time (h) | 15 | 18 | 18 | 18 | 18 | 18 |
6. | Maximum ethanol concentration (g/l) | 47.59 | 46.81 | 12.65 | 12.25 | 7.83 | 7.18 |
7. | Ethanol yield coefficient, Yp/s (g/g) | 0.495 | 0.485 | 0.479 | 0.474 | 0.476 | 0.468 |
8. | Ethanol production rate (QP) (g/l/h) | 3.173 | 2.6 | 0.703 | 0.680 | 0.435 | 0.398 |
9. | Fermentation efficiency (%) | 96.83 | 95.06 | 93.84 | 92.81 | 93.204 | 91.728 |
11. | Cell biomass concentration (g/l) | 7.51 | 7.21 | 7.54 | 6.96 | 5.74 | 4.94 |
12. | Cell biomass production rate, (QX) (g/l/h) | 0.5 | 0.40 | 0.418 | 0.386 | 0.318 | 0.274 |
13. | Specific growth rate (μ) (h−1) | 0.226 | 0.21 | 0.18 | 0.161 | 0.178 | 0.155 |