Assertion: lignin | /r/HasProperty | difficult to extract
Facets:
value: because of the presence of etherified units
type: CAUSE
Source sentences:
text: Pulping experiments of wood from field-grown COMT-downregulated poplars show that lignin of these plants is more difficult to extract from the pulp, presumably because of the reduced synthesis of S units and the presence of etherified units derived from 5-hydroxyconiferyl alcohol M15H, which are not cleavable in base (73, 78, 103).