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Título

X-ray diffraction analysis of internal wool lipids

AutorFonollosa Argemi, Jordi; Campos, Lourdes; Martí Gelabert, Meritxell; Maza, Alfons de la; Parra Juez, José Luis; Coderch Negra, M. Luisa
Palabras claveWide-angle X-ray diffraction (WAXD)
Small-angle X-ray diffraction (SAXD)
Polarised optical microscopy
Intercellular wool lipids (IWL)
Liposomes
Wool fibre
Fecha de publicación6-may-2004
EditorElsevier
CitaciónChemistry and Physics of Lipids 130(2): 159-166 (2004)
ResumenPolarised optical microscopy (POM) and X-ray diffraction techniques were applied to intercellular lipids extracted from wool to study their structural arrangement in order to determine their role in the diffusion properties of wool fibre. Intercellular wool lipids (IWL) arranged as concentrated liposomes were shown to be a good intercellular lipid model, allowing their study by X-ray diffraction techniques. The results confirm that intercellular lipids of wool fibre are organised in a lamellar structure of 5.0–8.0 nm width, termed β-layer, which had been assumed to be lipids arranged as a bilayer. Structurally, internal wool lipids are distributed at least in two domains at low temperatures: an ordered phase made up of ceramides and free fatty acids (FFA) alone, arranged in crystal orthorhombic states separately, and a liquid crystal state when mixed together. At 40 °C there is a reversible phase transition produced by the melt of the crystal orthorhombic states, whereas the liquid crystal state remains until 65 °C.
Descripción8 pages, 4 figures.-- PMID: 15172832 [PubMed].-- Printed version published Jul 2004.
Versión del editorhttp://dx.doi.org/10.1016/j.chemphyslip.2004.03.003
URIhttp://hdl.handle.net/10261/18549
DOI10.1016/j.chemphyslip.2004.03.003
ISSN0009-3084 (Print)
1873-2941 (Online)
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