Effects of Inorganic Salts on the Dissociation of a Complex of β-Cyclodextrin with an Azo Dye in an Aqueous Solution
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概要
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The apparent dissociation constant (<I>K</I><SUB>app</SUB>) of a complex between β-cyclodextrin and an azo dye, sodium <I>p</I>-(4-hydroxy-1-naphthylazo)benzenesulfonate, was determined by spectrophotometry in a phosphate buffer solution (pH 5.91) in the absence and in the presence of various inorganic salts at 25 °C. The cyclodextrin and the azo dye formed a 1 : 1 complex with the <I>K</I><SUB>app</SUB> value of 2.44×10<SUP>−3</SUP> M in a 0.1 M phosphate buffer. <I>K</I><SUB>app</SUB> decreased with an increase in the concentration of the phosphate buffer and with the addition of some inorganic salts, such as Li<SUB>2</SUB>SO<SUB>4</SUB>, Na<SUB>2</SUB>SO<SUB>4</SUB>, K<SUB>2</SUB>SO<SUB>4</SUB>, LiIO<SUB>3</SUB>, NaIO<SUB>3</SUB>, KIO<SUB>3</SUB>, and KF. These results were explained mainly in terms of the decrease in the activity of water, which takes part in the dissociation reaction of the inclusion complex, with an increase in the concentration of the inorganic salts. On the other hand, <I>K</I><SUB>app</SUB> increased with the addition of such salts as KCl, KBr, KI, KNO<SUB>3</SUB>, KSCN, and KClO<SUB>4</SUB>. These results were attributed mainly to the formation of the inclusion complexes of the cyclodextrin with the anions of these salts, competing with the azo dye for the cyclodextrin-binding site.
- 公益社団法人 日本化学会の論文
著者
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MATSUI Yoshihisa
Department of Life Science and Biotechnology Faculty of Life and Environmental Science Shimane Unive
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Mochida Kazuo
Department of Agricultural Chemistry, Shimane University
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Date Yoshio
Department of Agricultural Chemistry, Shimane University
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Kagita Akio
Department of Agricultural Chemistry, Shimane University
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Date Yoshio
Department of Agricultural Chemistry, Faculty of Agriculture, Shimane University
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Matsui Yoshihisa
Department of Agricultural Chemistry, Faculty of Agriculture, Shimane University
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