The Unique Self-assembling Behavior of Highly Purified Long Chain Mono Alkyl Phosphate Salt

Abstract

論文要旨：界面活性剤などの両親媒性物質が形成する自己組織体は学術的にも工業的にも利用価値が高く、 多くの研究がなされている。近年、従来は不安定であると考えられていた α ゲルが多くの注目を集め、様々 な研究が行われている。 我々も新たに α ゲルを構築しうる素材の開発を進め、その結果、モノアルキル純度を高めたアルキルリ ン酸が中和剤の選択により非常に安定な α ゲルを構築することを見出した。 本稿では特に化粧品分野で行われてきた α ゲルの研究例を示しながら、我々が見出した α ゲル形成素材 について述べる。 Abstract: Alkyl phosphates are well known and commonly used for a long time in the cosmetic and detergent field as a mild sur factant. However, many of general industrial products of alkyl phosphate in the market are the mixtures of mono-, di-and tri-esters which do not have the specific features of mono ester. In this study, by increasing the mono alkyl content, we tried to discover the new functional behavior and structure using the highly purified hexadecyl alkyl phosphate. Among the compounds studied, hexadecyl phosphate neutralized with L-arginine (R16MP-Arg) in an aqueous system showed characteristic solution proper ties and association behavior below Kraf ft temperature. Spontaneous swelling of R16MP-Arg was obser ved below the Kraf ft temperature, and a gel structures composed of R16MP-Arg and water was formed without heating and shaking. This gel was identified as a thermodynamically stable "α-gel" based on the results of DSC and SAXS measurements. In this study, we revealed that highly purified mono hexadecyl phosphate with L-arginine organized stable α-gel structure. Cosmetics in which this α-gel is used as the base give a refreshing and smoothing sensation when applied to the skin. The unique proper ty of R16MP-Arg is that it af fords a stable gel structure even when mixed with fatty alcohol.