UNDERSTANDING THE LIMITATIONS OF REMOVAL OF HEMICELLULOSES DURING AUTOHYDROLYSIS OF A MIXTURE OF SOUTHERN HARDWOODS

作者：Tunc Mehmet Sefik; Lawoko Martin^*; van Heiningen Adriaan

来源：BioResources, 2010, 5(1): 356-371.

• Southern hardwoods
• Autohydrolysis
• Lignin carbohydrate complex (LCC)
• Prehydrolysis factor (P-factor)
• Endoglucanase
• Endoxylanase
• Size exclusion chromatography (SEC)

Extraction of hemicelluloses from wood prior to pulping is being pursued to generate more value-added products, while still producing high quality pulp from the pre-extracted wood. For a better understanding of the factors limiting selective extraction, enzymatic hydrolysis in combination with size exclusion chromatography ( SEC) was applied to milled wood and hydrothermally treated wood. Complete dissolution was achieved in a lithium chloride/dimethylacetamide solvent system after mild ball-milling of a Southern Hardwood Mixture (SHM), of SHM extracted using auto-hydrolysis, and of enzyme-treated SHM. SEC tests showed that severe degradation of wood polymers occurred after a milling time of 3 hours. The SEC data also confirmed the presence of lignin-carbohydrate complexes. Based on the results, it is suggested that linkages between lignin and polysaccharides may play an important role in limiting extraction of hemicelluloses.

• 出版日期2010