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Table 2 Composition of the 6 different steam-pretreated lucerne samples

From: Reduced use of phosphorus and water in sequential dark fermentation and anaerobic digestion of wheat straw and the application of ensiled steam-pretreated lucerne as a macronutrient provider in anaerobic digestion

Pretreated material 1 2 3 4 5 6
DM (%) 15.7 13.4 12.9 12.9 14.1 15.0
WIS (%) 9.5 7.8 7.3 6.9 8.6 8.7
Composition of the WIS (in % of WIS)
 Glucan 41.5 41.2 41.3 40.7 42.9 40.4
 Xylan 7.4 6.9 6.5 6.3 7.3 5.9
 Galactan 2.0 2.0 2.6 2.9 1.5 1.5
 Arabinan 1.8 1.6 1.7 1.8 1.9 1.7
 AIL 36.4 40.2 36.0 37.2 35.5 37.3
 ASL 1.5 1.7 1.5 1.4 1.4 1.4
 Ash 1.2 0.5 1.2 1.2 0.7 2.1
 Total (%) 91.8 94.1 90.7 91.5 91.3 90.3
Composition of the liquid fraction (in g/L)
 Glucose* 0.8 0.6 0.6 0.8 0.8 0.9
 Xylose* 7.8 6.9 7.2 7.5 7.2 8.2
 Galactose* 2.4 1.5 1.6 2.5 2.4 2.0
 Arabinose* 2.0 1.3 1.5 1.9 1.8 1.7
 Lactic acid 7.3 7.1 6.8 7.0 6.7 7.7
 Acetic acid 7.9 7.6 7.3 10.3 9.7 11.6
  1. AIL acid insoluble lignin, ASL acid soluble lignin
  2. * Sum of monomers and oligomers, expressed as monomer concentration
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