Structure of xylan from culms of bamboo grass (Sasa senanensis Rehd.) |
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Authors: | Shigeki Yoshida Atsushi Kuno Naoto Saito Masakazu Aoyama Isao Kusakabe |
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Institution: | (1) Institute of Applied Biochemistry, University of Tsukuba, 305-8572 Tsukuba, Japan;(2) Hokkaido Forest Products Research Institute, 071-0198 Asahikawa, Japan |
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Abstract: | Xylan prepared from culms of kumaizasa (Sasa senanensis Rehd.), a representative species of bamboo grass, was hydrolyzed with-xylanase ofStreptomyces olivaceoviridis E-86. Four arabinoxylo-oligosaccharides and two glucuronoxylo-oligosaccharides were isolated from the enzymatic hydrolysate of the xylan by chromatography on a charcoal column, a Dowex 1-x8 column, a Toyo-pearl HW-40S column, and a LiChrospher 100 NH2 column and on preparative paper chromatography. The results of the structural analyses of the saccharides showed that the isolated oligosaccharides had the structures of 32--l-arabinofuranosyl-xylobiose, 32--l-arabinofuranosyl-xylotriose, 32---d-xylopyranosyl-(1 2)-l-arabinofuranosyl]-xylobiose, 33---d-xylopyranosyl-(1 2)-l-arabinofuranosyl]-xylotriose, 23--4-O-methyl-d-glucuronosyl-xylotriose, and 23--d-glucuronosyl-xylotriose. From the structural analysis of the oligosaccharides derived from the xylan, kumaizasa xylan was concluded to be a kind of arabinoglucuronoxylan having not only stubs of singlel-arabinose and singled-glucuronic acid but also stubs of disaccharide units such as-d-xylopyranosyl-(1 2)-l-arabinofuranose. |
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Keywords: | Bamboo grass Sasa senanensis Rehd Xylan Xylanase Xylooligosaccharide |
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