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A Heteroxylan and Hemicellulosic Materials from Bamboo Leaves, and a Reconsideration of the General Nature of Commonly Occurring Xylans and Other Hemicelluloses by Kenneth C.B. Wilkie; Swee-Leng Woo is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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The molec~~lar structures of water-soluble and -insoluble hemicelluloses of bamboo leaf, and of a hemicellulosic xylan from the former, have been examined. It is concluded that all the materials have the same structural features on their main xylan chain, namely, the side-chains or residues (u) r-arabmofuranose, (b) U-galactopyranosyl-(l-\*5)-r.-arabinofkranose, (c) O-galactopyranosyl-(1+4)-O-o-xylopyranosyl-(1+2)-L-arabinofuranose, (d) U-D-xylopyranosyl-(I-+2)-O-L-arabinofuranosyl-( 1+2)+arabinofuranose, (e) O-(D-glucopyranosyluronic acid)-(1 +4)-O-Dxylopyranosyl-(1+4)-galactopyranose, and m D-glucopyranuronic acid and its Pmethyl ether. Feature (ci) is proposed for the first time, but it may have been present in xylans studied by others. The mainxylose chain in the soluble, insoluble, and xylan materials have, respectively, 1 in every 2.8,4-O, and 7.6 xylan residues substituted by side residues or chains (u)-(e). It is concluded that the polysaccharide product recovered after methylation of the three hemicellulosic materials does not fully represent the quantitative composition of the materials 'subjected to methylation, although structural features (a), (d), and (e) are not much

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Author

Kenneth C.B. Wilkie; Swee-Leng Woo

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0008-6215)

Published

1977

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)