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Location of Lignin Moieties Along Polysaccharide Chains in Lignin-Carbohydrate Complexes
Abstract Timell (1965) reviewed the chemical basis of the evidence supporting the presence on glucomannans, the main polysaccharide of softwood hemicelluloses, of side chains other than a single side chain of D-galactose. Tyminski and Timell (1960) reported that the intrinsic viscosity of a glucomannan from white spruce in cupriethylenediamine was three times less than that of cellulose of the equivalent molecular weight. Linnell and Swenson (1966a) measured the hydrodynamics and molecular properties of the acetylated products of a glucomannan from black spruce (Picea mariana) in 1,1,2-trichloroethane by osmometry, viscometry and sedimentation equilibrium analysis. The glucomannan appeared to have a more compact molecular configurations than other β-1,4-linked polysaccharides such as cellulose and guaran, and hence was likely to have a branched structure. Linnell et al. (1966) extracted several glucomannan fractions varying in lignin content from the incompletely delignified spruce holocellulose, and determined the lignin content, the degree of polymerization and the intrinsic viscosity of the respective specimens. An increase in the degree of polymerization was found to be associated with an increase of the lignin content and, at the same time, with an increase of the molecular compactment of the glucomannan. The investigators concluded that these results suggested the presence of lignin-glucomannan linkages, and that the more compact configurations at increasing degrees of polymerization could be caused by formation of cross-links between lignin and glucomannan.
Location of Lignin Moieties Along Polysaccharide Chains in Lignin-Carbohydrate Complexes
Abstract Timell (1965) reviewed the chemical basis of the evidence supporting the presence on glucomannans, the main polysaccharide of softwood hemicelluloses, of side chains other than a single side chain of D-galactose. Tyminski and Timell (1960) reported that the intrinsic viscosity of a glucomannan from white spruce in cupriethylenediamine was three times less than that of cellulose of the equivalent molecular weight. Linnell and Swenson (1966a) measured the hydrodynamics and molecular properties of the acetylated products of a glucomannan from black spruce (Picea mariana) in 1,1,2-trichloroethane by osmometry, viscometry and sedimentation equilibrium analysis. The glucomannan appeared to have a more compact molecular configurations than other β-1,4-linked polysaccharides such as cellulose and guaran, and hence was likely to have a branched structure. Linnell et al. (1966) extracted several glucomannan fractions varying in lignin content from the incompletely delignified spruce holocellulose, and determined the lignin content, the degree of polymerization and the intrinsic viscosity of the respective specimens. An increase in the degree of polymerization was found to be associated with an increase of the lignin content and, at the same time, with an increase of the molecular compactment of the glucomannan. The investigators concluded that these results suggested the presence of lignin-glucomannan linkages, and that the more compact configurations at increasing degrees of polymerization could be caused by formation of cross-links between lignin and glucomannan.
Location of Lignin Moieties Along Polysaccharide Chains in Lignin-Carbohydrate Complexes
Professor Koshijima, Tetsuo (author) / Professor Watanabe, Takashi (author)
2003-01-01
15 pages
Article/Chapter (Book)
Electronic Resource
English
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