Solubilization Equilibrium Constants of Synthetic Perfumes in the Micellar Solutions of Nonionic Surfactants

DOI Web Site 5 Citations 14 References
  • KONDO Yukishige
    Fuculty of Science and Technology, Science University of Tokyo
  • MIZUGUCHI Katsunobu
    Fuculty of Science and Technology, Science University of Tokyo
  • TOKUOKA Yoshikazu
    Fuculty of Science and Technology, Science University of Tokyo Research Department, S. T. Chemical Co., Ltd.
  • UCHIYAMA Hirotaka
    Fuculty of Science and Technology, Science University of Tokyo Research and Development Department, Procter & Gamble Far East Inc.
  • KAMOGAWA Keiji
    Fuculty of Science and Technology, Science University of Tokyo
  • ABE Masahiko
    Fuculty of Science and Technology, Science University of Tokyo Institute of Colloid and Interface Science, Science University of Tokyo

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Other Title
  • 非イオン界面活性剤ミセル水溶液における合成香料の可溶化平衡定数
  • ヒ イオン カイメン カッセイザイ ミセル スイヨウエキ ニ オケル ゴウセイ

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The solubilization of synthetic perfumecompounds {2 -phenylethyl alcohol (PEA), benzyl acetate (BA), d-limonene (LN)} by four kinds of nonionic surfactant {hexadecylpolyoxyethylene ether (C16POEn ; n=10, 20, 30, 40)} was investigated in terms of the measurements of solubilization equilibrium constants and micellar diameter. The solubilization equilibrium constants of the perfume compounds decrease with POE chain length of the surfactants and/or the HLB number of the perfume compounds. The activity coefficient of PEA in C16POEn micelles is appre ciably smaller than those of the other perfumes and is 0.1-0.2. The number of the surfactant required to solubilize one perfume molecule (parameter 2B) is ; for LN, 0. 7-1. 0, for BA, O. 4-1. 0 for PEA, 1.7-2.8. Furthermore, the diameter of C16 POEn micelles increases with increasing amount of the solubilized PEA. These results show that PEA molecule would adsorb more strongly to the POE chains in the micellar hydrophilic region than LN and BA molecules, resulting in the dehydration of the POE chains.

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