A Kinetic Study of the Mutarotation of D-Xylose by the Polarographic Method
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概要
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The polarographic behavior of D-xylose in several buffer solutions was investigated. The rate constants, <I>k</I><SUB>1</SUB>, <I>k</I><SUB>2</SUB>, <I>k</I><SUB>−1</SUB>, and <I>k</I><SUB>−2</SUB>, of the mutarotation of α-D-xylose, assumed as α\overset<I>k</I><SUB>1</SUB>\underset<I>k</I><SUB>−1</SUB>\rightleftharpoonsγ\overset<I>k</I><SUB>2</SUB>\underset<I>k</I><SUB>−2</SUB>\rightleftharpoonsβ, were calculated by the use of Wiesner's method, but with a modified equation for the polarographic current. The overall mutarotation rate constant, <I>k</I><SUB>o</SUB>, which is denned by <I>k</I><SUB>o</SUB>=(<I>k</I><SUB>1</SUB><I>k</I><SUB>−2</SUB>+<I>k</I><SUB>−1</SUB><I>k</I><SUB>2</SUB>)⁄(<I>k</I><SUB>−1</SUB>+<I>k</I><SUB>−2</SUB>), was also determined. The rate constants, <I>k</I><SUB>o</SUB>, <I>k</I><SUB>1</SUB>, and <I>k</I><SUB>2</SUB>, were analyzed as a linear function of the buffer concentration. It was revealed that the catalytic effects of the buffer salts were mainly due to their basic components for all the buffer salts investigated. The Bronsted plots of <I>k</I><SUB>1</SUB> and <I>k</I><SUB>2</SUB> for all the basic components gave straight lines with the same slope of 0.42. The rate constants for several amines deviated from the slope; this deviation was ascribed to the steric hindrance caused by their large molecular sizes.
- 公益社団法人 日本化学会の論文
著者
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Senda Mitsugi
Department of Agricultural Chemistry, Faculty of Agriculture, Kyoto University
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Ikeda Tokuji
Department Of Agricultural Chemistry Faculty Of Agriculture Kyoto University
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Senda Mitsugi
Department Of Agricultural Chemistry College Of Agriculture Kyoto University
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