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Table 2 Effect of heat, ethanol and osmotic stresses on ethanol production by Z. mobilis TISTR548 and Z. mobilis Δgfo

From: Sorbitol required for cell growth and ethanol production by Zymomonas mobilis under heat, ethanol, and osmotic stresses

Fermentation parameter

Z. mobilis TISTR548

Z. mobilis Δgfo

Heat stress

30°C

35°C

37°C

30°C

35°C

37°C

P (g L-1)

72.69 ± 10.62

49.06 ± 1.46

41.87 ± 4.93

57.45 ± 5.03

21.00 ± 0.63

17.96 ± 0.42

Qp (g L-1 h-1)

1.21 ± 0.18

1.02 ± 0.04

1.16 ± 0.14

0.80 ± 0.07

0.44 ± 0.01

0.50 ± 0.01

Yps (g g-1)

0.47 ± 0.07

0.46 ± 0.08

0.46 ± 0.03

0.47 ± 0.06

0.40 ± 0.10

0.44 ± 0.09

Time (hours)

60

48

36

72

48

36

Ethanol stress

0%

7%

10%

0%

7%

10%

P (g L-1)

74.60 ± 3.08

40.73 ± 2.68

10.66 ± 2.24

58.03 ± 5.16

29.36 ± 2.24

2.68 ± 0.44

Qp (g L-1 h-1)

1.55 ± 0.20

0.85 ± 0.12

0.22 ± 0.10

0.97 ± 0.12

0.61 ± 0.04

0.07 ± 0.02

Yps (g g-1)

0.48 ± 0.07

0.44 ± 0.10

0.35 ± 0.05

0.47 ± 0.08

0.37 ± 0.12

0.10 ± 0.03

Time (hours)

48

48

48

60

48

36

Osmotic stress

200 g/L

250 g/L

300 g/L

200 g/L

250 g/L

300 g/L

P (g L-1)

77.67 ± 1.89

69.85 ± 2.44

34.42 ± 1.12

54.12 ± 5.22

45.80 ± 0.45

1.12 ± 0.25

Qp (g L-1 h-1)

1.29 ± 0.03

1.16 ± 0.04

0.57 ± 0.14

0.75 ± 0.07

0.64 ± 0.02

0.02 ± 0.02

Yps (g g-1)

0.50 ± 0.01

0.51 ± 0.01

0.35 ± 0.05

0.46 ± 0.11

0.44 ± 0.01

0.07 ± 0.03

Time (hours)

60

60

60

72

72

72

  1. P, ethanol concentration; Qp, volumetric ethanol productivity; Yps, ethanol yield.