タブ葉粘質物に関する研究-3-過ヨウ素酸酸化およびメチル化分析

概要

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In the previous studies of the mucilage isolated from the leaves "Tabu", it had been proved that the mucilage was an arabinoxylan composed of one mole of D-xylose and 1.2 moles of L-arabinose residues, [α] D-138.5(c, 0.26, water), DP 183. In this report, the chemical structure of this mucilage has been investigated by periodate oxidation, Smith degradation and methylation analysis. The mucilage consumed 0.68 moles of periodate, but neither formic acid nor formaldehyde was liberated. Polyaldehyde produced by periodate oxidation of the mucilage was reduced with borohydride to the corresponding polyalcohol. Complete acid hydrolysis of the polyalcohol yielded xylose and glycerol, in the molar ratio of (1:2). Methylation of the mucilage followed by acid hydrolysis gave 2, 3, 5-tri-O-methyl-L-arabinofuranose (5 moles), 2, 3-di-O-methyl-D-xylopyranose (1 mole), 2-O-methyl-D-xylopyranose (1 mole) and D-xylopyranose (2 moles). These results indicate that D-xylopyranose residue linked each other with β-form through C-1 and C-4, and that L-arabinofuranose residue was the non-reducing end groups, linked with C-2 and C-3 of polyxylose chain in β-form.
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