Kinetic Study of the Formation and Decomposition of Amylose-iodine-iodide Complex
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概要
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The complex formation reaction among amylose, iodine and iodide ion in aqueous solution was investigated with a stopped-flow apparatus. The forward reaction rate was found to be expressed as <I>v</I>=<I>k</I>[Amylose]([I<SUB>3</SUB><SUP>−</SUP>]–θ) for [I<SUB>3</SUB><SUP>−</SUP>]>θ, where θ is a critical value determining the mechanism. For [I<SUB>3</SUB><SUP>−</SUP>]>θ, the rate was considered to be determined by the process between a free amylose unit and free I<SUB>3</SUB><SUP>−</SUP>. For [I<SUB>3</SUB><SUP>−</SUP>]<θ, the rate-determining step is considered to be intramolecular conversion from an intermediate to a final product. The rate of the reaction between amylose units and I<SUB>3</SUB><SUP>−</SUP> is close to that of a diffusion-controlled process (7×10<SUP>8</SUP> M<SUP>−1</SUP> sec<SUP>−1</SUP>). These conclusions are supported by the study of the decomposition reaction of complex, using Na<SUB>2</SUB>S<SUB>2</SUB>O<SUB>3</SUB> or Ce(SO<SUB>4</SUB>)<SUB>2</SUB>.
- 公益社団法人 日本化学会の論文
著者
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Imamura Taira
Department Of Chemistry Faculty Of Science Hokkaido University
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Yamagishi Akihiko
Department Of Chemistry College Of Arts And Sciences The University Of Tokyo
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FUJIMOTO Masatoshi
Department of Chemistry, Faculty of Science, Hokkaido University
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