Abstract
A trisaccharide consisting of two d-xylose units and one l-arabinose unit, and a tetrasaccharide consisting of three d-xylose units and one l-arabinose unit were isolated from the hydrolyzate of rice-straw arabinoxylan by the xylanase I produced by Asp. niger.The structures of the trisaccharide and the tetrasaccharide were determined to be 31-α-l-arabinofuranosylxylobiose ([α]d− 80°) and 31-α-l-arabinofuranosylxylotriose ([α]d− 84°), respectively, by chemical and enzymic methods.According to the structures of two arabinose-xylose mixed oligosaccharides, it was shown that the rice-straw arabinoxylan is composed of chain of 1,4-linked βd-xylopyranose residues and some of xylose residues have side-chain of 1,3-linked α-l-arabinofuranose.
Published Version
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