Binding and catalytic properties of charged .BETA.-cyclodextrins.

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概要

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• The effects of the signs and structures of charged groups in modified β-cyclodextrins on their binding and catalytic properties were examined in aqueous solutions by using ammonium salt of mono(6-sulfonato-6-deoxy)-β-cyclodextrin and hydrogencarbonate salts of mono(6-trimethylammonio-6-deoxy)- and mono[6-(1-pyridinio)-6-deoxy]-β-cyclodextrins as charged hosts. An ionic guest was bound more strongly to an oppositely charged host than to an identically charged host. Binding constants for charged host-guest systems were affected by a change in the ionic strength and by the addition of dimethyl sulfoxide to an aqueous solution. The catalytic effects of the charged hosts on the alkaline hydrolyses of <I>o</I>-, <I>m</I>-, and <I>p</I>-acetoxybenzoic acids were also different from those of the parent β-cyclodextrin. These results could be explained in terms of electrostatic, steric, and hydrophobic interactions between the hosts and guests.

• 公益社団法人 日本化学会の論文

著者

• Mochida Kazuo

  Faculty of Agriculture, Shimane University

• Matsui Yoshihisa

  Faculty Of Agriculture Shimane University

• Ogawa Kouichi

  Faculty of Agriculture, Shimane University

• Mikami Seiji

  Faculty of Agriculture, Shimane University

• Yoshimoto Misao

  Faculty of Agriculture, Shimane University

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