インゲンマメペクチン性多糖の化学構造について (II)

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The pectic polysaccharide of kidney bean cotyledons was hydrolyzed by boiling under refluxing with 0.1 M oxalic acid. The product of hydrolysis, a xylogalacturonan, consisted of xylose, galacturonic acid and minor neutral sugars. The molar ratio of xylose-to-galacturonic acid was 48.8:100. Xylogalacturonan was converted into its reduced and methylated derivative. Hydrolysis of the methylated xylogalacturonan yielded 2, 3, 4-tri-O-methyl-D-xylose, 2, 3, 6-tri-O-methyl-D-galactose and 2, 6-di-O-methyl-D-galactose. Therefore, all xylose residues of the xylogalacturonan were present at non-reducing terminal and attached to the galacturonan chain as ‘stubs’ in one residue. As the xylo-galacturonan was hardly hydrolyzed with polygalacturonases, the side chains were probably equally distributed along the galacturonan chain. Methylation analysis of the pectic polysaccharide was also performed in the same manner as xylo-galacturonan, and the following compounds were identified: 2, 3, 5-tri-O-methyl-D-fucose, 2, 3, 4-tri-O-methyl-D-xylose, 2, 3-di-O-methyl-D-xylose, 2, 3, 6-tri-O-methyl-D-galactose, 2, 6-di-O-methyl-D-galactose and methylated arabinose. In the pectic polysaccharide of kidney bean cotyledons, xylose residues were present at not only the terminal but also internal positions. In the latter case, fucose may be linked with xylose to form fucosyl-xylose stubs in the galacturonan chain. The distribution of the side chains having the xylose residue on the galacturonan chain was probably the same as that of xylogalacturonan. Xylogalacturonan was subjected to acetolysis, and a polygalacturonide which was free of xylose and other neutral sugars was obtained. Hydrolysis of the uronide with polygalacturonases indicates that the pectic polysaccharide of kidney bean cotyledons consisted of α-1, 4-linked D-galacturonic acid.
社団法人日本農芸化学会の論文

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松浦康
岡山県立短期大学食物科

インゲンマメペクチン性多糖の化学構造について (II)

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