3 resultados
The question of whether lignin is covalently linked to carbohydrates in native wood, forming what is referred to as lignin carbohydrate complexes (LCC), still lacks unequivocal proofs. This is mainly due to the need of isolating lignin from woody materials prior to analysis, at conditions leading to
From the Flory-Stockmayer theory and molecular weights of successive fractions of lignin obtained by extraction of spruce wood with a mixture of water, dioxane, and hydrochloric acid and by sulfonation, the average length of the primary chains was estimated to be 18 phenylpropane units. From data on
Xylan-lignin (XL), glucomannan-lignin (GML) and glucan-lignin (GL) complexes were isolated from spruce wood, hydrolyzed with xylanase or endoglucanase/β-glucosidase, and analyzed by analytical pyrolysis and 2D-NMR. The enzymatic hydrolysis removed most of the polysaccharide moieties in the