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Molecular Diffusion in Polysaccharide Gel Systems as Observed by NMR

  • Shingo MatsukawaEmail author
  • Daisuke Sagae
  • Akiko Mogi
Part of the Progress in Colloid and Polymer Science book series (PROGCOLLOID, volume 136)

Abstract

The diffusion coefficients D of dendrimers in agar gel and pullulan in gellan gel were determined by pulsed field gradient spin-echo (PFGSE) NMR measurements. The ratio of D to D 0 (diffusion coefficient in dilute solution) was used to estimate mesh size. The mesh size increased as the temperature fell below the gelling temperature, suggesting that the solute polysaccharides are involved in aggregation. Changes in mesh size explain the experimental results of water exudation from a stored agar gel under compression and the heat resistance of gellan gel in the presence of divalent cations.

Keywords

Molecular diffusion Pulsed field gradient spin-echo NMR Gel mesh size Aggregation of polysaccharide 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  1. 1.Department of Food Science and TechnologyTokyo University of Marine Science and TechnologyTokyoJapan

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