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Table 2 Results obtained after 120 h of fermentation in Config.

From: Separate hydrolysis and co-fermentation for improved xylose utilization in integrated ethanol production from wheat meal and wheat straw

Expt Config.

Yeast load (g/L)

Xylose consumptionb (%)

Xylose conc. (g/L)

Xylitol formationc (%, g/L)

Glycerol conc. (g/L)

Ethanol conc. (g/L)

Ethanol yield (g/g)

Ethanol yieldd (%)

Config. 1

5 (fresh)

100

0.0

20 (2.5)

6.9

43.1

0.49

97

Config. 1

5 (fresh)

98

0.0

20 (2.6)

5.7

43.0

0.48

93

Config. 1

5 (2w)e

100

0.0

21 (2.8)

5.6

41.4

0.45

88

Config. 1

20 (2w)e

100

0.0

13 (1.6)

6.9

41.5

0.46

91

Config. 2

5 (fresh)

76

6.5

10 (1.9)

6.6

53.3

0.44

87

Config. 2

5 (fresh)

58

11.1

9 (1.4)

5.5

52.0

0.42

83

Config. 2

5 (2w)e

72

6.6

9 (1.4)

5.6

49.8

0.44

87

Config. 2

20 (2w)e

90

2.4

13 (2.7)

7.6

49.0

0.43

84

  1. 1 or Config. 2a
  2. aThe raw material used for the experiments was SPWS 2.
  3. bRelated to the total amount of available xylose.
  4. cRelated to consumed xylose.
  5. dCorresponding to the maximum theoretical yield from both glucose and xylose.
  6. eYeast stored in a refrigerator for two weeks (see Methods).
  7. Config. 1, wheat-starch hydrolysate feed; Config. 2, mixed hydrolysates feed.