Spacer-assisted catalytic action of imidazole-appended .GAMMA.-cyclodextrin.
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概要
- 論文の詳細を見る
Catalytic activity of γ-cyclodextrin bearing an imidazole moiety (<B>1</B>) was compared with that of the corresponding β-cyclodextrin derivative (<B>2</B>) in the hydrolysis of <I>p</I>-nitrophenyl acetate. The catalysts <B>1</B> and <B>2</B> hydrolyzed the ester 80 and 172 times, respectively, as fast in the complexes as the buffer without any catalyst. The binding of <B>1</B> for the ester was 40% weaker than that of <B>2</B>. When sodium 1-naphthaleneacetate was present in the catalytic systems, the hydrolysis rate was enhanced for <B>1</B>, but depressed for <B>2</B>. This rate enhancement of <B>1</B> suggests that sodium 1-naphthaleneacetate acts as a spacer which facilitates <B>1</B> to bind the substrate by narrowing the large γ-cyclodextrin cavity. The time dependency of <I>p</I>-nitrophenol formation under the conditions of large excess of <I>p</I>-nitrophenyl acetate to <B>1</B> or <B>2</B> exhibited that the inhibitory effect of the product was remarkable for <B>2</B>, but negligible for <B>1</B>.
- 公益社団法人 日本化学会の論文
著者
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TODA Fujio
Department of Bioengineerig, Faculty of Bioscience and Biotechnology, Tokyo Institute of Technology
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Ikeda Tsukasa
Department Of Applied Chemistry Utsunomiya University
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Hattori Kenjiro
Department Of Applied Chemistry Faculty Of Engineering Tokyo Institute Of Polytechnics
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Osa Tetsuo
Pharmaceutical Institute Tohoku University
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Ueno Akihiko
Pharmaceutical Institute, Tohoku University
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Ikeda Tsukasa
Department of Chemical Engineering, Faculty of Engineering, Tokyo Institute of Technology
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Moriwaki Fumio
Pharmaceutical Institute, Tohoku University
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