Adsorption of N-dodecyl-.BETA.-alanine to the spread monolayer of lecithin or dilaurin.
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概要
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The adsorption of <I>N</I>-dodecyl-β-alanine (NDA) was studied at the air–solution interface with the spread film of L-α,β-dimyristoyllecithin (DML) or α,α′-dilaurin (DIL). The adsorbed amounts were measured by radiometry using tritium-labelled NDA, combined with surface pressure measurements. Measurements of IR, DSC, and NMR were made in order to determine the bulk properties of amphoteric moieties in the mixture of DML and NDA. For the mixed monolayer of NDA and DML or DIL, the surface composition <I>vs.</I> area curves were obtained at various surface pressures. The molecular interaction in monolayer was discussed on the basis of the excess free energy of mixing, which was calculated at various surface pressures and compositions. As a result, the mixing of DIL and NDA in monolayer was ideal at surface pressures less than 5 mN m<SUP>−1</SUP>, whereas the mixed monolayer of DML and NDA showed a remarkable condensation in surface molecular area. Such a large condensation at low surface pressure was concluded to be due to the formation of ion pairs between the choline and alanine moieties on the water surface, by referring to the findings obtained by studying the lipid properties in the bulk phase. It was also found that the DML–NDA monolayer near close packing exhibited various types of complicated behavior, depending on the surface compositions. The appreciable differences in the nature of the amphoteric moieties in DML and NDA molecules can explain these findings.
- 公益社団法人 日本化学会の論文
著者
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Tsutsui Takao
Department Of Health Policy And Management Institute Of Industrial Ecological Sciences University Of
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Tajima Kazuo
Department of Chemistry Faculty of Science Tokyo Metropolitan University
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Tajima Kazuo
Department of Chemistry, Faculty of Science, Tokyo Metropolitan University
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