The excellent water-solubility of N-〔3-(dimethylamino)propyl〕docosanamide chloride: the most eco-friendly cationic hair conditioning agent
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- Sakai Takaya
- Material Science Research Laboratories, KAO Corporation
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- Inoue Katsuhisa
- Material Science Research Laboratories, KAO Corporation
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- Yamane Masayuki
- Safety Research Laboratories, KAO Corporation
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- Toyo Takamasa
- Safety Research Laboratories, KAO Corporation
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- Nishiyama Naohiro
- Safety Research Laboratories, KAO Corporation
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- Kaneko Youhei
- Material Science Research Laboratories, KAO Corporation
書誌事項
- タイトル別名
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- The Excellent Water-Solubility of N-[3-(dimethyl-amino)propyl] docosanamide Chloride : The Most Eco-friendly Cationic Hair Conditioning Agent
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A new hair-conditioning agent, N-[3-(dimethylamino)propyl]docosanamide (APA-22) hydrochloric acid salt (APA-22 HCl), has excellent solubility in water with a solubility limit over 10-times larger than that of other APA hydrochloric salts with shorter alkyl chain lengths. The physicochemical characteristics of APA-22 HCl were studied at 25°C by using equilibrium surface tension (γ), solubilization of an oil-soluble dye, steady-state fluorescence, and chloride ion selective electrode techniques. The APA-22 HCl salt is considered to form an aggregate at a concentration, C1, which is about twice the concentration of the solubility limit of APAs with shorter alkyl chains. At a higher concentration, C2, the aggregates of APA-22 HCl start forming another kind of aggregate, which is able to solubilize oil-soluble materials. That is, C1 is considered to represent the critical aggregation concentration (cac) and C2 a morphology transition. In the concentration region between C1 and C2 the solutions are seemingly transparent whereas at above C2 they appear bluish or translucent. Since the Krafft point of APA-22 HCl is 55°C, all the solutions, including the aggregates, are thought to exist in metastable states. Notably, however, these metastable solutions do not change significantly over a few months. The excellent solubility of APA-22 HCl in water is considered to be a result of this unique stepwise aggregation with increasing concentration.
収録刊行物
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- Journal of Oleo Science
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Journal of Oleo Science 57 (10), 521-527, 2008
公益社団法人 日本油化学会
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詳細情報 詳細情報について
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- CRID
- 1390001204091617536
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- NII論文ID
- 130000055435
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- NII書誌ID
- AA11503337
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- ISSN
- 13473352
- 13458957
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- NDL書誌ID
- 9645774
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- PubMed
- 18781052
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可