Table 3 Protective function of sorbitol on cell growth and ethanol production by Z. mobilis under heat, ethanol, and osmotic stresses
Treatment conditions | Fermentation parameter | |||||
|---|---|---|---|---|---|---|
Z. mobilis TISTR548 | Z. mobilis Δgfo | |||||
|  | μ(h-1) | P(g L-1) | Q P (g L-1 h-1) | μ(h-1) | P(g L-1) | Q P (g L-1 h-1) |
Heat stress | ||||||
30°C | 0.566±0.32 | 72.69±10.62 | 1.21±0.18 | 0.522±0.20 | 57.45±5.03 | 0.80±0.07 |
37°C | 0.280±0.24 | 41.87±4.93 | 1.16±0.14 | 0.123±0.25 | 17.96±0.42 | 0.50±0.01 |
37°C + 50 mM sorbitol | 0.508±0.30 | 47.70±3.56 | 1.33±0.17 | 0.502±0.22 | 50.12±1.54 | 1.04±0.06 |
Ethanol stress | ||||||
10% (v/v) | 0.340±0.25 | 12.10 ± 3.20 | 0.25±0.12 | 0.286±0.18 | 3.10 ± 1.12 | 0.06 ± 0.01 |
10% (v/v) + 50 mM sorbitol | 0.482±0.34 | 26.02 ± 2.15 | 0.54 ± 0.14 | 0.456±0.26 | 25.18 ± 2.45 | 0.52 ± 0.04 |
Osmotic stress | ||||||
300 g/L sucrose | 0.126±0.32 | 39.76±2.21 | 0.66±0.04 | 0.084±0.24 | 1.62±0.01 | 0.03±0.01 |
300 g/L sucrose + 50 mM sorbitol | 0.542±0.40 | 84.98±1.31 | 1.42±0.02 | 0.520±0.32 | 68.84±1.42 | 1.15±0.02 |