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    Interaction between Hydrophilic Ionic Liquid and Phospholipid/Cholesterol Mixed Film

    Year: 2022

    Journal: J. Oleo Sci., Volume 71, page 67–74

    Authors: Kaneko, Kotaro; Nakazato, Aki; Ishikawa, Akihiro; Kaneko, Nobuhiro; Yashita, Akira; Akamatsu, Masaaki; Sakai, Kenichi; Sakai, Hideki

    Keywords: hydrophilic ionic liquid; phospholipid; cholesterol; surface pressure-area (pi-A) isotherm; fluorescence anisotropy

    Surface pressure (pi)-area (A) isotherms were studied to analyze the interactions between a hydrophilic ionic liquid (IL) (ethyl(2-hydroxyethyl)dimethylammonium methanesulfonate) and a pure dipalmitoylphosphatidylcholine (DPPC) film or a DPPC-cholesterol mixed film. When the hydrophilic IL was added to an underlayer solution, the isotherm shifted toward higher areas. Intriguingly, when the hydrophilic IL was added, the packing of the film materials became loose and the elastic modulus decreased, resulting in increased flexibility. This phenomenon was most evident under a cholesterol mole fraction of 0.2. This composition resembles that of cell membranes, which typically comprise phospholipids and cholesterol, suggesting that this hydrophilic IL may be able to interact significantly with biological membranes.
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