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Dielectric study on the dynamics of an aqueous solution of gellan gum

  • N. ShinyashikiEmail author
  • T. Sakai
  • G. Yamada
  • S. Yagihara
Conference paper
Part of the Progress in Colloid and Polymer Science book series (PROGCOLLOID, volume 114)

Abstract

In order to make clear the dynamics of water related to the coil-helix and the sol-gel transitions in aqueous solutions of gellan gum, dielectric relaxation measurements of 2.5 and 5.0 wt% gellan gum aqueous solutions in the temperature range between 2.5 and 52.5 °C were performed over a frequency range from 30 Hz to 10 GHz using time-domain reflectometry. The dielectric relaxation peak of water is observed around 10 GHz, and the relaxation curve is well described by the Cole-Cole equation. The parameter for the symmetric distribution of the relaxation time, β, shows different temperature dependences below and above the coil-helix and sol-gel transitions. The conformation of gellan gum molecules affects the variation of the local structure of water.

Key words

Dielectric relaxation Gellan gum Water Coil-helix transition Sol-gel transition 

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Copyright information

© Springer-Verlag 1999

Authors and Affiliations

  • N. Shinyashiki
    • 1
    Email author
  • T. Sakai
    • 1
  • G. Yamada
    • 1
  • S. Yagihara
    • 1
  1. 1.Department of PhysicsTokai UniversityKanagawaJapan

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