Table 2 The fermentation performance of EC∆budC∆ldhA strain under different NaHCO₃ concentration

Final pH

5.43 ± 0.58

5.92 ± 0.021

5.94 ± 0.191

6.2 ± 0.127

6.56 ± 0.021

Consumed glucose (g L⁻¹)

67.45 ± 1.626

66.7 ± 4.808

61 ± 3.111

64.65 ± 4.879

67 ± 0.4.667

Final OD₆₀₀

4.21 ± 0.078

5.155 ± 0.007

5.305 ± 0.064

5.84 ± 0.113

5.79 ± 0.226

Final succinic acid (g L⁻¹)

1.15 ± 0.212

1.5 ± 0.283

1.4 ± 0.141

1.45 ± 0.212

1.55 ± 0.212

Final acetoin (g L⁻¹)

16.45 ± 0.212

15.3 ± 1.273

13.3 ± 0.707

14.7 ± 1.414

12.4 ± 1.556

Final 2,3-BDO (g L⁻¹)

3 ± 0.283

2.65 ± 0.212

2 ± 0.141

2.7 ± 0.283

1.95 ± 0.495

Final lactic acid (g L⁻¹)

ND

ND

ND

ND

ND

Final acetic acid (g L⁻¹)

ND

ND

0.9 ± 0

1.2 ± 0

1.5 ± 0.141

Final ethanol (g L⁻¹)

6.25 ± 0.354

6.8 ± 0.283

6.15 ± 0.212

6.05 ± 0.212

6.1 ± 0.566

Succinic acid yield (mol mol⁻¹)

0.026 ± 0.004

0.034 ± 0.004

0.032 ± 0.02

0.034 ± 0.02

0.036 ± 0.01

Acetoin yield (mol mol⁻¹)

0.499 ± 0.018

0.469 ± 0.005

0.446 ± 0.001

0.465 ± 0.01

0.381 ± 0.028

2,3-BDO yield (mol mol⁻¹)

0.089 ± 0.011

0.079 ± 0.001

0.066 ± 0.001

0.083 ± 0.002

0.059 ± 0.019