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- W2078449479 abstract "Electrophoretic mobility and 31P NMR measurements were combined to test whether the combination of the Henry, Boltzmann and Grahame equations is capable of describing the adsorption of divalent cations to phosphatidylcholine membranes. Cobalt was chosen for this study because, of all the common divalent cations, its effects on the 31P NMR spectrum of phosphatidylcholine membranes are easiest to interpret. Both the 31P NMR data on the adsorption of cobalt and the zeta potential data calculated from the electrophoretic mobility in the presence of cobalt are well described by the combination of these three equations. Electrophoretic mobility measurements were also performed with a number of other divalent cations and the zeta potentials were, in all cases, well described by the combination of these three equations. The binding deduced from such measurements decreases in the sequence: Mn2+, Mg2+, Ca2+, Co2+, Ni2+, Sr2+, Ba2+. If we assume that a lipid molecule occupies an area of 60 Å2 and that there is a 1: 1 stoichiometry for the binding of the divalent ions to phosphatidylcholine, the dissociation constants are, respectively: 0.3, 1.0, 1.0, 1.2, 1.2, 2.8, 3.6 M." @default.
- W2078449479 created "2016-06-24" @default.
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- W2078449479 date "1978-11-01" @default.
- W2078449479 modified "2023-10-18" @default.
- W2078449479 title "The adsorption of divalent cations to phosphatidylcholine bilayer membranes" @default.
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- W2078449479 doi "https://doi.org/10.1016/0005-2736(78)90203-1" @default.
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