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Table 1 Composition of spruce, expressed as % dry matter

From: The influence of solid/liquid separation techniques on the sugar yield in two-step dilute acid hydrolysis of softwood followed by enzymatic hydrolysis

Composition

Dry matter (%)

Material (I)

Dry matter (%)

Material (II)

Glucan

45.4

44.8

Xylan

3.8

6.0

Galactan

3.2

2.5

Arabinan

1.3

1.3

Mannan

10.3

13.8

Total lignin

31.5

28.9

Other components2

4.5

2.7

  1. 1 Total lignin is the sum of the acid-soluble and insoluble lignin.
  2. 2 Other components are extractives, ash, proteins, and some unknown compounds.