Table 3 Chemical composition (dry weight basis (%)) of raw materials and unwashed WIS

Benzene-alcohol (2:1) extractive

8.39 ± 0.10

12.14 ± 0.10

10.95 ± 0.07

19.97 ± 0.19

Glucan

40.52 ± 0.03

55.87 ± 0.03

38.75 ± 0.04

57.07 ± 0.03

Xylan

25.86 ± 0.19

3.05 ± 0.03

23.51 ± 0.18

1.80 ± 0.02

Acid-insoluble lignin

16.22 ± 0.02

17.67 ± 0.03

15.62 ± 0.16

16.89 ± 0.03

Acid-soluble lignin

2.0 ± 0.1

0.6 ± 0

2.4 ± 0

0.4 ± 0.1

Ash

3.59 ± 0.14

8.67 ± 0.10

3.65 ± 0.08

0.40 ± 0.04