The Dissolution Rate of Crystalline Glucose in Water -The Relation between the Dissolution Rate of α-D-Glucose after Saturation and the Rate Constant of Mutarotation-

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Other Title
  • 結晶グルコースの溶解速度 ―α-D-グルコース飽和後の溶解速度と変旋光速度定数の関係―
  • ケッショウ グルコース ノ ヨウカイ ソクド アルファ-D-グルコース ホウワ ゴ ノ ヨウカイ ソクド ト ヘンセンコウソクド テイスウ ノ カンケイ

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Description

D-Glucose has two anomeric isomers (a- and 8-type). In crystalline state, D-glucose is of a-type. When crystalline D-glucose dissolves in water, part of the dissolved a-D-glucose changes into 8-D-glucose. These properties of D-glucose exhibit an interesting phenomenon concerning the dissolution rate of crystalline D-glucose.<BR>In this study, the author attempted to derive a basic equation for determining the dissolution rate of crystalline D-glucose after the solution has been saturated with a-D-glucose. Experiments were conducted at 10-30° C in order to verify the equation. As a result of the experiments, it was clarified that the dissolution process of crystalline D-glucose has two rate-determining steps of diffusion and mutarotation. With the aid of this basic equation and the results of the experiments, it was made possible to measure the solubility of a-D-glucose. The derived rate equation is as follows:<BR>where<BR>Tg=Total concentration of D-glucose at time t, K=Tan 0 of linearlized mutual solubility curve, Pe=Solubility of 8-D-glucose at equilibrium, 1=Forward rate constant of mutarotation, I=Reverse rate constant of mutarotation, b=intercept of linearlized mutual solubility curve.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1974 (11), 2156-2162, 1974-11-10

    The Chemical Society of Japan

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