Table 2 Composition of the steam-pretreated substrates

g/L whole slurry

% of WIS

g/L whole slurry

% of WIS

g/L whole slurry

% of WIS

Total DM

203.2

-

113.1

-

138.9

-

WIS

135.2

-

77.1

-

98.5

-

Solid fraction

Glucan

73.1

54.0

50.2

65.1

59.6

60.5

Xylan

n.d.

n.d.

1.6

2.1

6.6

6.7

Galactan

0.7

0.5

0.5

0.6

n.d.

n.d.

Arabinan

n.d.

n.d.

0.9

1.2

0.3

0.3

Mannan

3.1

2.3

n.d.

n.d.

n.d.

n.d.

Insoluble lignin

57.2

42.3

20.9

27.2

26.6

27.0

Liquid fraction

Glucose

22.4

-

2.3

-

2.6

-

Glucose oligomers

1.7

-

0.6

-

1.3

-

Xylose

9.7

-

21.8

-

10.9

-

Xylose oligomers

n.d.

-

3.5

-

18.1

-

Galactose

4.1

-

1.1

-

0.8

-

Galactose

oligomers

n.d.

-

0.1

-

0.7

-

Arabinose

2.3

-

3.3

-

1.5

-

Arabinose

Oligomers

n.d.

-

n.d.

-

0.6

-

Mannose

20.9

-

n.d.

-

0.8

-

Mannose

oligomers

0.1

-

n.d.

-

n.d.

-

Lactic acid*

2.4

-

0.1

-

0.5

-

Glycerol

n.d.

-

n.d.

-

0.3

-

Acetic acid

4.6

-

2.1

-

3.6

-

HMF

2.3

-

0.3

-

0.1

-

Furfural

1.4

-

1.0

-

1.0

-

Soluble lignin

2.3

-

2.1

-

3.0

-