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Table 3 Fermentation parameters in corn cob hydrolysate (detoxified and non-detoxified) at 30 °C in oxygen-deprived conditions

From: Xylose fermentation efficiency of industrial Saccharomyces cerevisiae yeast with separate or combined xylose reductase/xylitol dehydrogenase and xylose isomerase pathways

Strain

Hydrolysate

Xylosei (g/L)

Xylosef (g/L)

Ethanolf (g/L)

Xylitolf (g/L)

Glycerolf (g/L)

Yet/sug (g/g)

Yxyol/xyl (g/g)

DCW (g/L)

PE-2∆GRE3

Detoxified corn cob

 

XR/XDHa

26.7

3.43 ± 0.07

6.09 ± 0.05

10.3 ± 0.1

0.821 ± 0.013

0.261 ± 0.001

0.442 ± 0.005

2.50 ± 0.10

XR/XDH + XIb

26.7

3.46 ± 0.79

6.06 ± 0.28

9.91 ± 0.46

2.57 ± 1.82

0.260 ± 0.003

0.427 ± 0.034

2.80 ± 0.20

XIc

26.7

1.31 ± 0.07

11.2 ± 0.3

0.714 ± 0.029

0.880 ± 0.384

0.439 ± 0.012

0.028 ± 0.001

3.80 ± 0.50

CA11

 

XR/XDHd

26.7

3.79 ± 0.17

4.93 ± 0.05

10.6 ± 0.1

1.47 ± 0.13

0.215 ± 0.004

0.462 ± 0.007

2.50 ± 0.10

XR/XDH + XIe

26.7

2.07 ± 0.05

9.23 ± 0.07

4.94 ± 0.05

0.571 ± 0.004

0.374 ± 0.004

0.200 ± 0.002

3.25 ± 0.15

XIf

26.7

0.438 ± 0.035

11.6 ± 0.2

0.958 ± 0.053

1.47 ± 0.03

0.440 ± 0.008

0.036 ± 0.002

4.60 ± 0.30

PE-2∆GRE3

Non-detoxified corn cob

 

XR/XDHa

28.0 ± 0.1

7.16 ± 0.74

6.29 ± 0.80

5.46 ± 0.54

1.55 ± 0.05

0.272 ± 0.025

0.264 ± 0.036

1.77 ± 0.03

XR/XDH + XIb

28.0 ± 0.1

15.8 ± 2.6

4.04 ± 0.80

3.06 ± 0.09

0.956 ± 0.069

0.279 ± 0.004

0.262 ± 0.050

1.43 ± 0.17

XIc

28.0 ± 0.1

25.3 ± 0.5

1.16 ± 0.15

0.275 ± 0.026

0.393 ± 0.076

0.243 ± 0.057

0.107 ± 0.011

1.07 ± 0.07

CA11

 

XR/XDHd

28.6 ± 0.0

10.9 ± 0.5

4.83 ± 0.35

5.15 ± 0.04

2.03 ± 0.13

0.244 ± 0.008

0.291 ± 0.006

2.23 ± 0.03

XR/XDH + XIe

28.6 ± 0.0

8.33 ± 1.05

8.55 ± 0.22

1.44 ± 0.08

1.20 ± 0.22

0.384 ± 0.013

0.0716 ± 0.0074

2.40 ± 0.00

XIf

28.6 ± 0.0

25.8 ± 0.3

1.34 ± 0.10

0.275 ± 0.047

0.608 ± 0.210

0.279 ± 0.013

0.0977 ± 0.0073

1.60 ± 0.27

  1. Fermentation time course was 73 and 96 h for detoxified and non-detoxified hydrolysate, respectively. Xylosei and Xylosef are the xylose concentrations at the initial and final time of fermentation, respectively. Ethanolf, Xylitolf and Glycerolf are the ethanol, xylitol and glycerol concentrations at the final time, respectively. Yet/sug is the ethanol yield from initial sugar calculated at final time of fermentation. Yxyol/xyl is the xylitol yield from xylose calculated at the final time of fermentation. DCW is the dry cell weight at final time. Detoxified Corn Cob—Xylosef: d,e**; d,f***; e,f**. Ethanolf: a,c**; b,c**; d,e***; d,f****; e,f**. Xylitolf: a,c***; b,c***; d,e****; d,f****; e,f****. Glyferolf: d,e**; e,f**. Yet/xyl: a,c***; b,c***; d,e***; d,f***; e,f**. Yxyol/xyl: a,c**; b,c**; d,e****; d,f****; e,f***. DFW: d,f*; e,f*. Non-detoxified Corn Cob- Xylosef: a,c**; b,c*; d,f**; e,f***. Ethanolf: a,c*; d,e**; d,f**; e,f***. Xylitolf: a,b*; a,c**; b,c*; d,e****; d,f****; e,f**. Glycerolf: a,b*; a,c**; b,c*; d,f*. Yet/xyl: d,e**; e,f*. Yxyol/xyl: d,e***; d,f***. DCW: a,c*