油/水界面張力に及ぼすグリセリドの影響に関する研究

概要

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The interfacial tension at an oil/water interface was measured at 25°C, using various glycerides and fatty acids in n-decane as the oil phase. Among the laurins and lauric acid, 1-monolaurin was most effective in lowering the interfacial tension from 52 mN·m-1 to 5 mN·m-1 while 1, 2-dilaurin, 1, 3-dilaurin, trilaurin and lauric acid lowered it to 25 mN·m-1, 29 mN·m-1, 36 mN·m-1, and 30 mN·m-1, respectively. This result can be explained as follows : the effects of glycerides to lower the interfacial tension become stronger with increasing number of free OH groups. The OH group in the a-position of a glyceride is more effective than that in the β-position. When 6 × 10-3 M SDS was added to the water phase, 1-monolaurin and lauric acid in n-decane interacted with it at the n-decane/water interface, causing the interfacial tension to drop to less than 1 mN·m-1 and producing the spontaneous emulsification at the interface.
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