Effect of monovalent ions on the monolayers phase behavior of the charged lipid DPPG

Article Abstract:

Research was conducted to carry out brewster angle microscopy studies on dipalmitoyl phosphatidyl glycerol monolayers on water subphases supporting different amounts of sodium chloride. It was assumed that resulting acids correlated with the electrolyte concentration in the subphase. Results indicated the effectiveness of the method for determining the dissociation constant of the lipid for monolayers supporting charged surfactant molecules.

Water, Ions, Surface active agents, Lipid research, Salt, Salt (Food), Water analysis

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A novel method to evaluate the phase transition thermodynamics of Langmuir monolayers. Application to DPPG monolayers affected by sulphase composition

Article Abstract:

A pure dipalmitoyl phosphatidyl glycerol (DPPG) monolayer is investigated to simplify the chemical composition of the monolayer and consequently, the respective thermodynamic description is presented. It is shown that the proposed treatment for a determination of the two-dimensional phase transition thermodynamics may be recommended for systems where the application of other method fails.

Monomolecular films, Thermodynamics

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Interfacial behavior of spread SP-B and SP-C layers and the influence of Oligomerization and secondary structure

Article Abstract:

A theoretical model presented to fit the experimental surface pressure/area isotherms of different samples of the surfactant proteins Sp-B and Sp-C is discussed. The basic idea of the model is that the protein molecules at the interface can occupy different areas per molecule depending on the kind of phase, liquid expanded or liquid condensed.

Observations, Proteins, Protein structure, Chemistry, Physical and theoretical, Physical chemistry, Atomic properties

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