acid insoluble lignin

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Biomass

Lignin is mostly insoluble in mineral acids, and therefore can be analyzed gravimetrically after hydrolyzing the cellulose and hemicellulose fractions of the biomass with sulfuric acid. ASTM E-1721-95 describes the standard method for determining acid insoluble lignin in biomass.

National Renewable Energy Laboratory (NREL) — Glossary of Biomass Terms retrieved 2014-06-15