Extraction and Characterization of Original Lignin and Hemicelluloses from Wheat Straw

Original lignin and hemicelluloses were sequentially extracted with high yield/purity, using acidic dioxane/water solution and dimethyl sulfoxide, from ball-milled wheat straw. The acidic dioxane lignin fraction is distinguished by high β-O-4‘ structures and by low amounts of condensed units (β-5‘,...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 2005-02, Vol.53 (4), p.860-870
Main Authors: Sun, Xiao-Feng, Sun, Fowler, Paul, Baird, Mark S
Format: Article
Language:English
Subjects:
Aldehydes - analysis
Biological and medical sciences
carbohydrate composition
Cereal and baking product industries
chemical structure
extraction
Food engineering
Food industries
Fourier transform infrared spectroscopy
Fundamental and applied biological sciences. Psychology
General aspects
hemicellulose
Hydroxybenzoates - analysis
lignin
Lignin - chemistry
Lignin - isolation & purification
Magnetic Resonance Spectroscopy
Molecular Weight
nuclear magnetic resonance spectroscopy
Polysaccharides - chemistry
Polysaccharides - isolation & purification
Spectroscopy, Fourier Transform Infrared
sugars
Triticum - chemistry
Triticum aestivum
wheat straw
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Summary:Original lignin and hemicelluloses were sequentially extracted with high yield/purity, using acidic dioxane/water solution and dimethyl sulfoxide, from ball-milled wheat straw. The acidic dioxane lignin fraction is distinguished by high β-O-4‘ structures and by low amounts of condensed units (β-5‘, 5-5‘, and β-1‘). Hemicelluloses contain arabinoxylans as the major polysaccharides, which are substituted by α-l-arabinofuranose, 4-O-methylglucuronic acid, acetyl group (DS = 0.1), and xylose at O-3 and/or O-2 of xylans. It was found that arabinoxylans form cross-links with lignins through ferulates via ether bonds, glucuronic acid via ester bonds, and arbinose/xylose via both ether and glycosidic bonds, respectively, in the cell walls of wheat straw. Diferulates are also incorporated into cross-links between lignin and hemicelluloses as well as lignification of wheat straw cell walls. The guaiacyl unit is considered to be a significant condensed structural constructor in extracted lignin and a connector between lignin and carbohydrates. Keywords: Wheat straw; lignin; hemicelluloses; NMR
ISSN:0021-8561
1520-5118
DOI:10.1021/jf040456q