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Table 1 Composition of structural carbohydrates and lignin in the water-insoluble fractions of the pretreated materials and sugar compositions and prevalence of inhibitory compounds in hydrolyzate liquors

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

 

Severe wheat straw slurry

Mild wheat straw slurry

Steam-pretreated material (% of dry weight)

 Glucan

51.4

50.7

 Xylan

1.7

1.0

 Galactan

0.0

BDL

 Arabinan

0.1

0.05

 Mannan

0.1

0.07

 Acid-soluble lignin

0.7

0.6

 Acid-insoluble lignin

33.8

29.8

 Lignin ash

6.9

10.2

 Total determined

94.6

92.4

Hydrolyzate liquor (g·L−1)

 Glucose

14.5

8.7

 Xylose

32.6

35.4

 Galactose

BDL

0.9

 Arabinose

3.5

1.8

 Mannose

1.8

0.7

 Formic acid

1.6

0.8

 Acetic acid

8.5

5.6

 Levulinic acid

BDL

0.5

 HMF

1.3

0.3

 Furfural

7.7

3.7

  1. BDL below detection limit