期刊
CHEMISTRY AND PHYSICS OF LIPIDS
卷 134, 期 1, 页码 51-58出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.chemphyslip.2004.12.002
关键词
ceramides; biophysics; domains; skin barrier; spectroscopy
IR spectroscopic studies are reported for N-stearyi-D-erythro-phytosphingosine (Cer NP) and N-stearyl-2-hydroxy-D-erythro-phytosphingosine (Cer AP) in a hydrated model of the skin lipid barrier comprised of equimolar mixtures of each ceramide with cholesterol and d(35)-stearic acid. Examination of the methylene stretching, rocking and bending modes reveal some rotational freedom and hexagonal packing in both the ceramide and stearic acid chains. Analysis of the acid carbonyl stretch and the ceramide Amide I modes show both shift to higher frequencies, indicating weaker hydrogen bonding, in the mixed systems compared to the pure materials. For both systems, the fatty acid chain disordering temperatures are significantly increased from those of the pure acids. The observed behaviors of these phytosphingosine ceramide systems are fundamentally different from the previously reported analogous sphingosine ceramide systems. The implications of these observations for lipid organization in the stratum corneum are briefly discussed. (c) 2004 Elsevier Ireland Ltd. All rights reserved.
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