The binding and catalytic properties of a positively charged cyclodextrin.
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概要
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In order to learn the significance of electrostatic interactions between charged groups in an enzymatic process, a positively charged cyclodextrin, mono-(6-trimethylammonio-6-deoxy)-β-cyclodextrin hydrogencarbonate (βCDtma), was prepared as a simple enzyme model, and its binding and catalytic properties were examined. The dissociation constant for an inclusion complex of βCDtma with an azo dye, sodium 4-(4-hydroxy-1-naphthylazo)-1-naphthalenesulfonate (<B>1</B>), was found to be 5.4×10<SUP>−5</SUP> mol/dm<SUP>3</SUP> in an alkaline solution (pH 10.5, <I>I</I><SUB>c</SUB>=0.0 mol/dm<SUP>3</SUP>) at 25 °C, the value being smaller than that for an inclusion complex of the parent β-cyclodextrin (βCD) with <B>1</B> by a factor of <I>ca</I>. 4. The catalytic effect of βCDtma on the alkaline hydrolyses of <I>o</I>-, <I>m</I>-, and <I>p</I>-acetoxybenzoic acids was significantly different from that of βCD. These observations were explained in terms of electrostatic and hydrophobic interactions between βCDtma and a guest molecule.
- 公益社団法人 日本化学会の論文
著者
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Matsui Yoshihisa
Department of Agricultural Chemistry, Faculty of Agriculture, Shimane University
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Okimoto Akihiko
Department of Agricultural Chemistry, Shimane University
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