Mutarotation of a-D-Glucose in Aqueous Solution of Boric Acid

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Other Title
  • ホウ酸水溶液中におけるα-D-グルコースの変旋光
  • Mutarotation of .ALPHA.-D-Glucose in Aqueous Solution of Boric Acid.

Description

Change in electric conductivity of aqueous solution of boric acid by the addition of a-Dglucose was investigated and it was found that the conductivity increased considerably by the addition of α-D-glucose, and then decreased gradually with time. The decrease in the conductivity was deduced to result from mutarotation of α-D-glucose toβ-D-glucose, which made the amount of the complex formed between α-D-glucose and boric acid lower. Mutarotation rate of α-D-glucose at various concentrations of boric acid was investigated, and the rate was found to increase once, and then decrease with increasing concentration of boric acid, showing a maximum at a certain concentration of boric acid, which was dependent on the concentration of α-D-glucose. On the assumptions that 1) boric acid can form the complex with α-D-glucose alone, 2) oxonium ion produced by the formation of the complex between boric acid and α-D-glucose catalyzes the mutarotation of α-D-glucose, and 3) the α-D-glucose molecules in the complex cannot cause mutarotation, a theoretical equation was derived for the mutarotation rate. The comparison of the values of mutarotation rate calculated using the equation with observed ones, confirmed that the theoretical equation describes approximately well the mutarotation rate of α-D-glucose in boric acid aqueous solution, and the above assumptions were concluded to be acceptable as the first approximation.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1992 (8), 830-833, 1992-08-10

    The Chemical Society of Japan

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