A Study on the Situation of Water in Various Moist Starches by the Wide Line Method of Proton Magnetic Resonance (PMR)

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  • NARA Shozo
    Departntent of Agricultural Chemistry, Faculty of Agriculture, Mie University
  • MORI Akira
    Departntent of Agricultural Chemistry, Faculty of Agriculture, Mie University
  • KOMIYA Takashi
    Departntent of Agricultural Chemistry, Faculty of Agriculture, Mie University
  • KUMAZAWA Zenzaburo
    Departntent of Agricultural Chemistry, Faculty of Agriculture, Mie University

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  • 広幅核磁気共鳴による湿潤でんぷん
  • ヒロハバ カク ジキ キョウメイ ニヨル シツジュン デンプン ニカンスルケン

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Abstract

A study on the situation of water in various starches which adsorbed and desorbed various moisture by means of the vapor pressure method, was undertaken by the wide line method of proton magnetic resonance (PMR). The results were as followed : 1. The half width of the PMR spectra of various starches was reduced by increasing of moisture contents, and especially, it became very narrower in the range of moisture contents more than 20%. 2. There were no significant differences between the half width in moisture adsorption and that in moisture desorption in the same moisture contents . 3. The relation between the half width and moisture contents gave two straight lines which intersected on half-logarithm graph. In the point of intersection of the graph, the moisture contents of various starches, such as tapioca, potato, corn, sweet potato, wheat and rice were 19. 1, 17. 3, 16. 2, 15. 7, 14.4 and 13.7%, respectively and the values of half width of potato, tapioca and other starches in the moisture content of 0% which were estimated by extrapolation were 45, 33 and 35 ppm, respectively.

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