Evaluation of Bound Water in Water-Soluble Dietary Fibers by the Pulsed NMR and Isotherm Methods.

DOI
  • SATO Yukinori
    Laboratory of Chemistry, Faculty of Home Economics, Kyoritsu Women's University
  • NOGUCHI Shun
    Laboratory of Chemistry, Faculty of Home Economics, Kyoritsu Women's University

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Other Title
  • パルスNMR法および収着等温線法を用いた水溶性食物繊維の結合水

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Description

Three water-soluble dietary fibers (SDFs : polydextrose, non-digestible dextrin, and a partially decomposed guar gum) were examined for the behavior of bound water. The monolayer water content (g/100 g of dry matter) was found to be 3-6 g by the sorption isotherm method, whereas it was 1-3 g by the pulsed NMR method. The correlation time for the bound water in SDFs was in the range 2-5×10-9 sec. These values are 3 orders greater than that for free water, indicating that the bound water detected by the pulsed NMR method represents the monolayer sorption water in an aqueous solution, where the substrates are more motional than those in the solid state. In addition, the enthalpy change in the bound water formation from 10°C to 30°C was from-14 to-36 kJ/mol, suggesting that the formation of bound water was exothermic and associated with 1-2 hydrogen bonds/water molecule.

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Details 詳細情報について

  • CRID
    1390001206332579968
  • NII Article ID
    130003705574
  • DOI
    10.11428/jhej1987.44.185
  • ISSN
    18820352
    09135227
  • Text Lang
    en
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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