Miscibility behavior of ternary lipidphospholipid/water systems

Dörfler, H.‐D.; Pietschmann, N.

doi:10.1007/bf01410298

Cited by 6 publications

(2 citation statements)

References 25 publications

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“…The mixture would then present a solid−liquid miscibility gap. For example, Blume and co-workers applied this model to phospholipid mixtures and Dörfler to lipid−phospholipid systems.…”

Section: Resultsmentioning

confidence: 99%

Balance of pH and Ionic Strength Influences on Chain Melting Transition in Catanionic Vesicles

et al. 2004

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We study the thermotropic phase transition of “salt-free” mixtures of single-tailed cationic and anionic surfactants, called “catanionic systems” in this paper, for concentrated (10 wt %) and diluted (0.5 wt %) samples. Small-angle neutron scattering (SANS) and differential scanning calorimetry (DSC) demonstrate that the chain melting phase transition is identical for diluted and concentrated samples at the same mole fraction (r) of anionic surfactants. The addition of anionic surfactants (for r = 0.5−0.7) induces an increase of the global surface charge, followed by an increase of the main transition temperature. This evolution may be interpreted as the hydrogen bonding formation between carboxylic acid headgroups. At r ∼ 0.6, corresponding to the region where facetted vesicles are formed, the “melting” of the alkyl chains is a progressive process extending over 15 °C. Here, molten and crystallized bilayers coexist in swollen lamellar phases of catanionic bilayers. This coexistence explains the increase of the viscosity of the solution, via structural reorganization of the bilayers or friction between the partially fused vesicles.

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Section: Resultsmentioning

confidence: 99%

Balance of pH and Ionic Strength Influences on Chain Melting Transition in Catanionic Vesicles

et al. 2004

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“…In sub-sequent papers these studies will be extended to the corresponding pseudo-binary cephaline and lecithin systems [8] in the so called water-saturated twophase regions (50 wt.% water). In order to derive data for phase diagrams, we subjected the following binary systems to calorimetric investigations: Myristic acid/pentadecanoic acid, palmitic acid methyl ester/heptadecanoic acid methyl ester and palmitic acid methyl ester/arachidic acid methyl ester.…”

Section: Introductionmentioning

confidence: 99%

Phase and miscibility behavior of binary lipid systems

Dörfler

Pietschmann

1990

Colloid & Polymer Sci

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Differential scanning calorimetry was applied to study the phase diagrams of the following binary lipid systems: myristic acid (C13COOH) / pentadecanoic acid (C14COOH); palmitic acid methyl ester (C15COOMe) / heptadecanoic acid methyl ester (C16COOMe); palmitic acid methyl ester (C15COOMe) / stearic acid methyl ester (C17COOMe); palmitic acid methyl ester (CIsCOOMe) / arachidic acid methyl ester (C19COOMe). A distinct succession in the phase diagram types and phase regions was observed, according to the chemical structure of the mixing components. In the systems C13COOH/C14COOH; C15COOMe/C16COOMe and C16COOMe/ C17COOMe, both components are completely miscible in the low-and high-temperature phase. Contrasting with these three binary lipid systems, the system C15COOMe/ C14COOMe shows complete miscibility only in the high-temperature phase, but almost complete demixing in the solid state. In the phase diagram an incongruent melting "1:1 complex" is built up. This "complex" forms an eutectic mixture with the phase of C15COOMe and a peritectic system with C19COOMe.

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Two-dimensional condensation in camphor-10-sulphonic acid films at the mercury/electrolyte interface

Drfler

Dietrich

Mller

et al. 1990

Colloid & Polymer Sci

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The electrocapillarity and the barrier properties of camphor-10-sulphonic acid (CS) in various aqueous electrolytes (1 M Na2SO4, 3 M LiC104, 2 M KNO3, 3 M KC1, 3 M KBr) were studied. From the electrocapillary curves the charge-density-potentialand the surface-pressure-potential-curves were calculated and analyzed using the Lippmann-Helmholtz and Gibbs-equations. The cross-sectional areas aA of CS, resulting from the maximum excess surface concentration, suggest a perpendicular orientation of CS-molecules in the condensed film at the potential of maximum adsorption. This orientation causes a dense packing and a strong interaction between the CS-molecules in the condensed film. The barrier properties that represent the reduction of Cu2+-ions in the presence of the adsorption layer were studied dc polarographically at high surface coverage. A change in the inhibition mechanism was observed due to the change of the structure in the adsorptions layer. The electrode reaction is strongly inhibited within the potential and concentration range of film condensation.

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Miscibility behavior of ternary lipidphospholipid/water systems

Cited by 6 publications

References 25 publications

Balance of pH and Ionic Strength Influences on Chain Melting Transition in Catanionic Vesicles

Balance of pH and Ionic Strength Influences on Chain Melting Transition in Catanionic Vesicles

Phase and miscibility behavior of binary lipid systems

Two-dimensional condensation in camphor-10-sulphonic acid films at the mercury/electrolyte interface

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