Document Detail


Thermal dependence of Raman descriptors of ceramides. Part II: effect of chains lengths and head group structures.
MedLine Citation:
PMID:  21069298     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
The outermost layer of the mammalian skin, the stratum corneum (SC), represents the main skin barrier. The SC lipids have a very exceptional composition, as the main lipid classes are ceramides (CER), long-chain fatty acids and cholesterol. Information on the function of each CER subclass and on the relation between CER lipid organisation and composition is of great importance to unravel the mechanism controlling the skin barrier function. Raman spectroscopy has been increasingly used for the study of intra- and inter-molecular structures of long-chain lipid compounds. In this study, we employed Raman spectroscopy to evaluate the effect of (1) the chain length and (2) the polar head architecture on the conformational order and organisational behaviour of CERs. The relation between the structure and the stability of the organisation was studied by monitoring the thermotropic response of each CER in the temperature range between 25 and 95 °C. This work enabled the determination of a correlation between the gauche/trans ratio in the νCC region and the state of the lateral packing. Moreover, it was shown that -OH groups in the α position of the fatty acids reduce the stability while long alkyl chains reinforces the intra- and inter-chains order.
Authors:
Emmanuelle Guillard; Ali Tfayli; Michel Manfait; Arlette Baillet-Guffroy
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Publication Detail:
Type:  Journal Article     Date:  2010-11-11
Journal Detail:
Title:  Analytical and bioanalytical chemistry     Volume:  399     ISSN:  1618-2650     ISO Abbreviation:  Anal Bioanal Chem     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-01-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101134327     Medline TA:  Anal Bioanal Chem     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1201-13     Citation Subset:  IM    
Affiliation:
EA 4041 Group Chimie Analytique de Paris Sud, Faculty of Pharmacy, Paris-Sud University, 92290 Châtenay-Malabry, France.
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