Literature DB >> 28147550

Characterization of the interface of binary mixed DOPC:DOPS liposomes in water: The impact of charge condensation.

Cornelis Lütgebaucks1, Carlos Macias-Romero1, Sylvie Roke1.   

Abstract

Solutions of liposomes composed of binary mixtures of anionic dioleoylphosphatidylserine (DOPS) and zwitterionic dioleoylphosphatidylcholine (DOPC) are investigated with label-free angle-resolved (AR) second harmonic scattering (SHS) and electrophoretic mobility measurements. The membrane surface potential is extracted from the AR-SHS response. The surface potential changes from -10 to -145 mV with varying DOPS content ( from 0% to 100%) and levels off already at ∼ 10 % DOPS content. The ζ-potential shows the same trend but with a drastically lower saturation value (-44 mV). This difference is explained by the formation of a condensed layer of Na+ counterions around the outer leaflet of the liposome as predicted by charge condensation theories for polyelectrolyte systems.

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Year:  2017        PMID： 28147550     DOI： 10.1063/1.4974084

Source DB:  PubMed          Journal:  J Chem Phys        ISSN： 0021-9606            Impact factor:   3.488


  9 in total

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9.  Label-free and charge-sensitive dynamic imaging of lipid membrane hydration on millisecond time scales.

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  9 in total

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