Phase behaviour of model stratum corneum lipid mixtures: an infrared spectroscopy investigation

Article Abstract:

A study has shown that the stratum corneum skin layer as modeled has polymorphism which goes from crystalline domains having heterogeneous bilipid composition and orthorhombic chain packing to a fluid and homogeneous phase. Phase behavior of model stratum corneum lipid mixtures has been studied by use of infrared spectroscopy. Mixing and structural properties were investigated. The model was an equimolar mixture of type III ceramides, perdeuterated palmitic acid, and cholesterol. In some mixtures sphingomyelin, a ceramide precursor, was used instead of ceramides. Binary mixtures were also studied.

Physiological aspects, Lipids, Infrared spectroscopy, Epidermis

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2H NMR studies of dipalmitoylphosphatidylcholine and dipalmitoylphosphatidylcholine--cholesterol bilayers at high pressure

Article Abstract:

It appears that pressure does not bring on substantial repositioning of cholesterol bilayers in a range recently studied. It seems that cholesterol reduces sensitivity of bilayer properties to pressure. Wideline deuterium NMR studies of dipalmitoylphosphatidylcholine and dipalmitoylphosphatidylcholine have been carried out to investigate cholesterol bilayers under high pressure.

Cholesterol, Nuclear magnetic resonance, High pressure chemistry, Deuterium, Phase rule and equilibrium, Phase equilibrium

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Evidence for room temperature mesomorphism in a mixed-valent diruthenium(II, III) quintapalmitoleate polymer

Article Abstract:

Evidence that there is room-temperature mesomorphism in a mixed-valent diruthenium(II, III) quintapalmitoleate polymer has been found. No others reports have been made of room-temperature mesomorphism in a mixed-valent metallomesogen. A solid-to-liquid crystal transition was found at 128 degrees C after synthesis and characterization were carried out.

Polymers, Liquid crystals, Valence, Valence (Chemistry), Ruthenium

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