Interaction of Hydrophobic Ionic Liquids with Lipids in Langmuir Monolayers

被引:10
|
作者
Goncalves da Silva, Amelia M. P. S. [1 ]
机构
[1] Univ Lisbon, Inst Super Tecn, Ctr Quim Estrut, P-1049001 Lisbon, Portugal
关键词
AIR-WATER-INTERFACE; MIXED MONOLAYERS; TEMPERATURE; ACID; CHOLESTEROL; PHOSPHONIUM; INSERTION; FILMS; DPPC;
D O I
10.1021/acs.langmuir.7b04164
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The interaction of two ionic liquids, trihexyl(tetradecyl)phosphonium bis(trifluoromethylsulfonyl)-imide and trihexyl(tetradecyl)phosphonium dicyanamide, [P-6 6 6 14]-[Ntf(2)] and [P-6 6 6 14]/[N(CN)(2)], with several long-chained lipids with a different net charge at the hydrophilic group, a cationic surfactant, dioctadecyldimethylammonium bromide (DODAB), a zwitterionic phospholipid (DPPC), an anionic phospholipid (DPPG), and the neutral stearic acid (SA), was investigated at the air-water interface using the Langmuir trough technique. The experimental surface pressure-area (pi-A) isotherms obtained for selected compositions of each binary system reveal distinct interfacial behavior. The degree and the nature of the IL-lipid interaction strongly depend on the charge distribution in the lipid polar group. Miscibility, or immiscibility, at the monolayer was inferred from the comparison of the experimental pi-A isotherm with the theoretical curve calculated for the corresponding ideal mixture based on the pi-A isotherms of the pure components. Phase separation and partial miscibility occurred in IL/DODAB and IL/DPPC systems, respectively. In both the IL/DPPG and the IL/SA systems, a new catanionic complex was found. For the IL/SA system, the catanionic complex formation varies with the subphase pH.
引用
收藏
页码:3797 / 3805
页数:9
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