Assertion: unmodified lignin | /r/HasAspect | negligible charge density
Facets:
Source sentences:
text: The conditions were optimized, and the unmodified lignin had a negligible charge density and 0.03 mmol/g of the sulfonate group, while the sulfomethylated lignin presented -1.6 mEq/g charge density and 1.48 mmol/g of the sulfonate group.