Thermodynamik der Mischphasen

Haase, Rolf

doi:10.1007/978-3-662-22546-2

Cited by 298 publications

(96 citation statements)

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“…The liposomal phase and the aqueous detergent monomer solution is treated as described above, however, a more complex thermodynamic description of the micelles is used. The cylindrical parts and inhomogeneous end-caps (inhomogeneous with regards to detergent and lipid distribution compared to the distribution within the cylindrical part of the micelle) are considered, in analogy to the Gibbs treatment of interfaces [77,78]. Using the Gibbs approach and considering the translational entropy of micelles, Roth et al [75] determined the chemical potentials of the lipid and detergent in the micellar phase.…”

Section: Increase Of Detergent Concentrationmentioning

confidence: 99%

Membranolytic Activity of Bile Salts: Influence of Biological Membrane Properties and Composition

et al. 2007

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Abstract:The two main steps of the membranolytic activity of detergents: 1) the partitioning of detergent molecules in the membrane and 2) the solubilisation of the membrane are systematically investigated. The interactions of two bile salt molecules, sodium cholate (NaC) and sodium deoxycholate (NaDC) with biological phospholipid model membranes are considered. The membranolytic activity is analysed as a function of the hydrophobicity of the bile salt, ionic strength, temperature, membrane phase properties, membrane surface charge and composition of the acyl chains of the lipids. The results are derived from calorimetric measurements (ITC, isothermal titration calorimetry). A thermodynamic model is described, taking into consideration electrostatic interactions, which is used for the calculation of the partition coefficient as well as to derive the complete thermodynamic parameters describing the interaction of detergents with biological membranes (change in enthalpy, change in free energy, change in entropy etc). The solubilisation properties are described in a so-called vesicle-to-micelle phase transition diagram. The obtained results are supplemented and confirmed by data obtained from other biophysical techniques (DSC differential scanning calorimetry, DLS dynamic light scattering, SANS small angle neutron scattering).

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Section: Increase Of Detergent Concentrationmentioning

confidence: 99%

Membranolytic Activity of Bile Salts: Influence of Biological Membrane Properties and Composition

et al. 2007

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“…With increasing amounts of KCI the system tends to the virtual titration end point m, = 4 meq. Above pH' = 5 the dissociation of the third step starts and reaches an inflection point at pK 3 ; the fourth starts above pH = 7.5 and reaches an inflection point at pK 4 • Finally, at m, = [e'] = 8 meq the real titration end point is reached and shows itself in a distinctly recognizable break of the pH"-curve. Since due to e' + e" > 0, a surplus of alkali is present, the pH curves tend to limiting values in the alkaline range at continued addition of KCI.…”

Section: As a Consequencementioning

confidence: 93%

Acid‐Base‐Equilibria at Semipermeable Membranes, their Influence on pH‐Triggered Permeabilities

Schlögl

Hirsch-Ayalon

1988

Ber Bunsenges Phys Chem

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Biophysical Chemistry / Chemiosmotic Equilibria / Electrochemistry / Interfaces / Membranes / Precipitation Membranes / ThermodynamicsThe theory of Donnan-equilibria is extended to systems in which chemical equilibria are involved. Equal temperatures of the outer phases, as well as ideal solutions are assumed. The membranes shall be impermeable for at least one ionic species. Comparison of the theory with experimental data at precipitation membranes shows a conspicuous dependence of the permeabilities on the pH-values of the fluid phases. A hypothetical model to explain this effect is discussed.tained in the fluid phases. Equilibration of temperature is assumed.

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“…It is in the nature of such a power series that, in fact, the accuracy of numerical description changes due to the manner of truncation, nevertheless, the mathematical essence of the approach always remains the same. Therefore it is not surprising when Haase [17] (p. 360) showed that the polynomial nowadays ascribed to Redlich and Kister is completely identical with the conventional ansatz of Margules. The same was later underlined by others ( [7], p. 225; [18]).…”

Section: Practical Consequencesmentioning

confidence: 99%

Chemical Potential vs. Gibbs Free Energy Relationship by Redlich and Kister and the Redlich-Kister Polynomial

Näfe¹

2014

Int. J. Thermo

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The relationship of Redlich and Kister between the chemical potential and the molar Gibbs free energy of a multicomponent mixture proves to be in contradiction with both fundamental concepts of chemical thermodynamics and mathematical principles. Hence, it is invalid. This invalidity corresponds with the thermodynamically inadequate representation of the prevalent Redlich-Kister polynomial for the mole fraction dependence of the excess Gibbs free energy of a mixture.

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Thermodynamik der Mischphasen

Cited by 298 publications

References 0 publications

Membranolytic Activity of Bile Salts: Influence of Biological Membrane Properties and Composition

Membranolytic Activity of Bile Salts: Influence of Biological Membrane Properties and Composition

Acid‐Base‐Equilibria at Semipermeable Membranes, their Influence on pH‐Triggered Permeabilities

Chemical Potential vs. Gibbs Free Energy Relationship by Redlich and Kister and the Redlich-Kister Polynomial

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