Constitutional Studies on the Mucilage of “Yamanoimo, ” <i>Dioscorea batatas</i> Decne, <i>forma Tsukune</i>

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  • Constitutional Studies on the Mucilage of “Yamanoimo, ” Dioscorea batatas Decne, forma Tsukune
  • Isolation and Structure of a Mannan

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Description

A mucilage extracted from tubers of Dioscorea batatas Decne, forma Tsukune with cold water has been found to contain a mannan associated firmly with protein. A water-insoluble mannan ([α]D-31°, formic acid), isolated from the mucilage by formation of copper hydroxide-complex, is a β-(1→4)-linked D-mannan of _??_ 110. Mlethylation and periodate oxidation studies indicated that it has a small degree of branching at the C-3 positions of the mannose residues, one out of 10_??_11 units. The oligosaccharides, separated from the enzymic digest of the mannan, were characterized by methylation analysis to be 4-O-β-D-mannosyl-D-mannose, and O-β-D-mannosyl-(1→4)-β-D-mannosyl-(1→4)-β-D-mannose.<br> The native mannan ([α]D-30.6° in water), isolated from the mucilage after degradation of the protein moiety with _??_ proteolytic enzyme, was homogeneous and had molecular weight 23, 000 (sedimentation analysis). It is partially acetylated (O-acetyl, 14.2%), most probably at the C-2 and/or C-3 positions.<br> On the basis of these findings, the constitution of the mucilage has been discussed.

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Details 詳細情報について

  • CRID
    1390001206468372736
  • NII Article ID
    130003523922
  • DOI
    10.1271/bbb1961.36.761
  • COI
    1:CAS:528:DyaE38XkvF2rtb0%3D
  • ISSN
    18811280
    00021369
  • Text Lang
    en
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
    • OpenAIRE
  • Abstract License Flag
    Disallowed

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