Rheological properties of welan gum in aqueous media.

DOI 5 Citations
  • TAKO Masakuni
    Department of Agricultural Chemistry, College of Agriculture, University of the Ryukyus
  • KIRIAKI Masahiro
    Department of Agricultural Chemistry, College of Agriculture, University of the Ryukyus

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Description

The flow behavior and dynamic viscoelasticity of welan gum solutions were measured with a rheogoniometer. The welan gum showed shear-thinning behavior at a concentration of 0.1%, but plastic behavior above 0.3% at 25°C. The dynamic viscoelasticity increased with increasing concentration, and was scarcely changeable with increasing temperature even at 80°C. Gelation did not occur even in a polysaccharide concentration of 1.0% at low temperature (0°C). An increase of the dynamic modulus was not observed on the addition of CaCl2 (6.8 mM). The dynamic viscoelasticity of welan gum solution was scarcely changeable in a wide range of pH from 2 to 12. The dynamic modulus was also scarcely changeable on addition of urea (4.0 M). Possible mode of intramolecular associations between the OH-4 of the D-glucosyl residue and the adjacent hemiacetal oxygen atom of the L-rhamnosyl residue, and between the methyl group of the L-rhamnosyl residue and the adjacent hemiacetal oxygen atom of the D-glucosyl residue were proposed.

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Details 詳細情報について

  • CRID
    1390001206460783360
  • NII Article ID
    110006324706
  • NII Book ID
    AA00515312
  • DOI
    10.1271/bbb1961.54.3079
  • COI
    1:CAS:528:DyaK3MXksFemtw%3D%3D
  • ISSN
    18811280
    00021369
  • Text Lang
    en
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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