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    Modulation of Interfacial Hydration by Carbonyl Groups in Lipid Membranes

    Year: 2020

    Journal: Langmuir, Volume 36, MAR 17, page 2644–2653

    Authors: Perez, HA; Cejas, JP; Rosa, AS; Gimenez, RE; Disalvo, EA; Frias, MA

    Organizations: ANPCyTANPCyT [PICT 2015-1111]; UNSE [23/A209]; CONICETConsejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)

    The lack of carbonyl groups and the presence of ether bonds give the lipid interphase a different water organization around the phosphate groups that affects the compressibility and electrical properties of lipid membranes. Generalized polarization of 1,2-di-O-tetradecyl-sn-glycero-3-phosphocholine (14:0 diether PC) in correlation with Fourier transform infrared (FTIR) analysis indicates a higher level of polarizability of water molecules in the membrane phase around the phosphate groups both below and above T-m. This reorganization of water promotes a different response in compressibility and dipole moment of the interphase, which is related to different H bonding of water molecules with phosphates (PO) and carbonyl (CO) groups.
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