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- W2049452016 abstract "Neutral liposomes composed of DMPC (dimyristoylphosphatidylcholine), DPPC (dipalmitoylphosphatidylcholine) or DSPC (distearoylphosphatidylcholine) are found to exhibit non-zero zeta potentials in an electric field even when they are dispersed in solution at pH 7.4. A model for the orientation of lipid head groups is proposed to explain the observed non-zero zeta potentials. The dependence of the zeta potential on temperature and ionic strength is analyzed via this model to obtain the information on the direction of the lipid head group in the liposome surface region. The direction of the lipid head group is found to be sensitive to the temperature and the ionic strength of the medium. At low ionic strengths, the phosphatidyl groups are located at the outer portion of the head group region. At constant temperature, as the ionic strength increases, the choline group approaches the outer region of the bilayer surface while the phosphatidyl group hides behind the surface. At the phase transition temperature of the lipid, the phosphatidyl group lies in the outer-most region of the surface and the choline group is in the inner-most region." @default.
- W2049452016 created "2016-06-24" @default.
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- W2049452016 date "1991-11-01" @default.
- W2049452016 modified "2023-10-02" @default.
- W2049452016 title "Temperature- and ionic strength-induced conformational changes in the lipid head group region of liposomes as suggested by zeta potential data" @default.
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- W2049452016 doi "https://doi.org/10.1016/0301-4622(91)80017-l" @default.
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