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タイトル: Effect of the side chain of N-acyl amino acid surfactants on micelle formation: An isothermal titration calorimetry study
著者: Ohta, Akio link image link image
Toda, Kosuke
Morimoto, Yu
Asakawa, Tsuyoshi link image link image
Miyagishi, Shigeyoshi
太田, 明雄
淺川, 毅
宮岸, 重好
発行日: 2008年 3月20日
出版社(者): Elsevier
雑誌名: Colloids and Surfaces A: Physicochemical and Engineering Aspects
ISSN: 0927-7757
巻: 317
号: 1-3
開始ページ: 316
終了ページ: 322
キーワード: Enthalpy of micelle formation
Hydrophobicity of amino acid residue
Isothermal titration calorimetry
N-Acyl amino acid surfactant
Side chain of amino acid
抄録: The enthalpy of micelle formation, critical micelle concentration (CMC), and aggregation number of micelles for seven amino acid type surfactants, sodium N-dodecanoyl-glycinate (C12Gly), -l-alaninate (C12Ala), -l-valinate (C12Val), -l-leucinate (C12Leu), -l-phenylalaninate (C12Phe), -l-glutaminate (C12Gln), and -l-threoninate (C12Thr), were obtained at three temperatures ranging from 288.15 to 308.15 K by isothermal titration calorimetry. The enthalpies of micelle formation for these surfactants were positive at 288.15 K and decreased with increasing temperature to ultimately become negative above 308.15 K. The CMC of the amino acid surfactants decreased monotonously with increasing hydrophobicity of the amino acid residue without exception, while with the exception of the C12Phe system, the enthalpy of micelle formation increased. The micellization behavior of C12Phe also deviated from that of other amino acid systems in terms of the heat capacity and the aggregation number. These results suggest the presence of a strong intra-micelle interaction between the side chains of phenylalanine. © 2007 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.colsurfa.2007.10.028
URI: http://hdl.handle.net/2297/8949
資料種別: Journal Article
版表示: author
出現コレクション:1.査読済論文(工)

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