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Structural characterization and isolation of lignin and hemicelluloses from barley straw
- Source :
-
Industrial Crops & Products . May2011, Vol. 33 Issue 3, p588-598. 11p. - Publication Year :
- 2011
-
Abstract
- Abstract: Structural characterization and isolation of lignin and hemicelluloses from crops are very important for industrial utilization. In this paper, the sequential treatments of barley straw using 90% dioxane, 80% acidic dioxane, 100% dimethyl sulfoxide, and 8% NaOH released total 93% of original lignin and 87% of original hemicelluloses. The extractions with acidic dioxane and dimethyl sulfoxide produced the original hemicelluloses and high-condensed lignin mainly from the middle lamella. FT-IR and NMR analyses show that the hemicelluloses of barley straw contain acidic arabinxylans as the major polysaccharides, which are substituted by α-l-arabinofuranose, 4-O-methyl-glucuronic acid, acetyl group (DS=0.13), and xylose at O-3 and/or O-2 of xylan, and lignin contains β-O-4′ as a predominant interunit linkage with high amounts of β-5′ and β-1′. The guaiacyl and syringyl units are more etherified, and the proportion of erythro-β-O-4′ is slightly higher than that of threo-β-O-4′ in the lignin of barley straw. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09266690
- Volume :
- 33
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Industrial Crops & Products
- Publication Type :
- Academic Journal
- Accession number :
- 59774037
- Full Text :
- https://doi.org/10.1016/j.indcrop.2010.12.005