Interaction of hydrophobic cyclic dipeptides and acylbenzenes as studied by fluorescent quenching.
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概要
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The effect of the hydrophobic interaction on the association in aqueous media of tyrosine-containing cyclic dipeptides and 1-acyl-4-bromobenzenes having various lengths of acyl chain was investigated by quenching of the fluorescence of the former compounds by the latters. In ethanol, the change of fluorescence intensity (<I>I</I><SUB>0</SUB>⁄<I>I</I>) was linearly related to the quencher concentration according to the Stern-Volmer's plot, which was attributed to a dynamic quenching. In this case, structures of fluorophores and quenchers did not affect the quenching constant. However, in a buffer solution, <I>I</I><SUB>0</SUB>⁄<I>I</I> was linearly related to the quencher concentration according to the Perrin's plot, which was attributed to a static quenching. Perrin's quenching constants depended on the structure of fluorophores and quenchers. In some cases, a quencher molecule was bound to a fluorophore by hydrophobic interaction in a favorable arrangement for fluorescent quenching. In aqueous solution, fluorophores and quenchers formed comparatively large aggregates with nonspecific arrangement for fluorescent quenching. In this case, Perrin's quenching constants were independent of the nature of quenchers and related with the size of formed aggregates.
- 公益社団法人 日本化学会の論文
著者
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Kimura Shunsaku
Department Of Material Chemistry Graduate School Of Engineering Kyoto University
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Imanishi Yukio
Department Of Material Chemistry Graduate School Of Engineering Kyoto Univeresity
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Ootubo Toshiro
Department of Polymer Chemistry, Kyoto University
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