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- W1497257568 abstract "The superficial layer of the skin, the stratum corneum, is the main barrier for diffusion of substances across the skin. The stratum corneum is composed of corneocytes embedded in lipid lamellae. In previous studies two lamellar phases have been identified with periodicities of 6.4 and 13.4 nm of which the 13.4 nm phase (long periodicity phase = LPP) is considered to be very important for the skin banier function. The main lipid classes in stratumcorneum are ceramides, free fatty acids and cholesterol. Until now 8 subclassesof ceramides are identified in human stratum corneum referred to as ceramide 1 to 8. Studies with mixtures prepared with isolated human ceramides revealed that cholesterol and ceramides are very important for the formation of the lamellar phases. After addition of free fatty acids the lipids are organised in an orthorhombic packing with a small proportion of lipids in a liquid phase. Our most recent results show that the presence of ceramide 1 and the formation of a liquid phase are crucial elements for the formation of the LPP. These observations and the broad-narrowbroad sequence of lipid layers in the LPP led us to propose a molecular model for this phase. This consists of one narrow central lipid layer with fluid domains with on both sides a broad layer with a crystalline structure. This model is referred to as `the sandwich model'." @default.
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- W1497257568 date "2002-01-01" @default.
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- W1497257568 doi "https://doi.org/10.1023/a:1019983715589" @default.
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