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Table 3 Summary of results after prefermentation of hydrolyzate liquor followed by fed-batch cofermentation of enzymatic hydrolyzate

From: Prefermentation improves ethanol yield in separate hydrolysis and cofermentation of steam-pretreated wheat straw

Fig.

Description

Residual sugars and end-products

Xylose utilization

Yields

Glucose

Xylose

Xylitol

Ethanol

 

Ethanola

Xylitolb

g·L−1

g·L−1

g·L−1

g·L−1

%

g·g−1

%

g·g−1

 

S, Model

0.1

5.3

2.0

28.9

75.9

0.346

67.9

0.120

 

M, Model

0.1

1.2

5.7

32.2

96.1

0.360

70.6

0.191

2a

S, B, 2

0.3

6.4

2.3

37.0

70.6

0.381

74.8

0.135

2b

S, FB, 2

32.5

17.5

0.6

16.0

ND

0.164

32.2

ND

3a

M, B, 1

0.1

0.1

3.1

38.7

98.0

0.401

78.5

0.112

3b

M, FB, 1

0.1

0.4

1.0

40.9

96.9

0.423

82.9

0.036

3c, 4b

M, B, 2

0.1

1.6

3.2

38.5

92.4

0.398

78.1

0.123

4a

M, B, 2 c

0.5

4.7

1.4

27.3

ND

0.287

56.2

ND

3d

M, FB, 2

0.1

2.0

1.5

39.6

90.9

0.409

80.2

0.058

  1. S severe slurry; M mild slurry; B batch prefermentation; FB fed-batch prefermentation; 1 1 addition of enzymatic hydrolyzate; 2 2 additions of enzymatic hydrolyzate, ND not determined
  2. aEthanol yield based on total supplied glucose and xylose and related to the maximum theoretical yield (0.51 g·g−1)
  3. bXylitol yield based on total consumed xylose
  4. c12, M, B, 2 with insufficient prehydrolysis