Miscibility of gramicidin A-ethyl nonadecanoate in Langmuir monolayers in the presence of salts dissolved in the subphase

Article Abstract:

Surface pressure area isotherms complemented with Brewster angle microscopy (BAM) images were used for studying the behavior of binary mixed Langmuir monolayers composed of gramicidin A (GA) and ethyl nonadecanoate (EN) spread on aqueous subphases containing NaCl and CaCl2. A pronounced expansion at the interface is caused by the presence of GA in mixtures with EN and the presence of GA in the film also controls the behavior of mixed monolayers.

Solubility, Chemical properties, Ethyl compounds

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Study of gramicidin A-Phospholipid interactions in Langmuir monolayers: Analysis of their mechanical, thermodynamical, and electrical properties

Article Abstract:

The mechanical, thermodynamical, and electrical properties assessed from measurement of pressure-area isotherms and of Maxwell displacement currents (MDC) are analyzed to determine the mechanisms of interactions between gramicidin A (gA) and dimyristoylphosphatidylcholine (DMPC) in monolayers formed at the air-water interface. It is observed that the strongest interaction between gA and DMPC occurs at the gA/DMPC molar ratio at around 0.25.

Thin films, Multilayered, Multilayered thin films, Thermodynamics, Mechanical properties

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Langmuir monolayers characteristic of (perfluorodecyl)-alkanes

Article Abstract:

A series of semifluorinated n-alkanes (SFAs) of the general formula F(CF2)m(CH2)nH, where m=10 and n=6-20 are synthesized and used for Langmuir monolayer characterization. Under a variety of experimental conditions such as spreading volume, subphase temperature, and compression speed, surface pressure and electric surface potential measurements were obtained.

Usage, Observations, Monomolecular films, Chemistry, Physical and theoretical, Physical chemistry, Alkanes, Atomic properties

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