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Intermolecular Interaction between a Synthetic Pseudoceramide and a Sterol-Combined Fatty Acid
MedLine Citation:
PMID:  9441616     Owner:  NLM     Status:  Publisher    
To better understand the phase behavior of a pseudoceramide (SLE), a potential skin moisturizer and/or a drug carrier, we investigated the lipid-lipid interaction between SLE and a sterol-combined fatty acid (CEOS), which has a sterol ring and a carboxyl group in a molecule. X-ray analysis showed that a hexagonal packing (4.15 A spacing) and a liquid-like packing (4.5 A spacing) coexisted within the hydrocarbon chains of the SLE/CEOS (1/1 mole) lipid mixture. The structural characteristics were very similar to those of the SLE/stearic acid/cholesterol (1/1/1 mole) system, which was in a stable lamellar alpha-phase. However, in the SLE/stearic acid (1/1 mole) system, there was only a strong hexagonal reflection in the wide-angle X-ray profile. The melting enthalpy (23.9 kJ mol-1) and entropy (75.0 J mol-1 K-1) of the SLE/CEOS system were also smaller than those (DeltaHm = 43.9 kJ mol-1, DeltaSm = 131.6 J mol-1 K-1) of the SLE/stearic acid system. The X-ray data along with the DSC results suggested that the sterol ring of CEOS molecule contributed to the enhancement of molecular motion or the decrease in the molecular packing of lipids. A strong hydrogen bond between the carboxyl group of CEOS and the amide group of SLE molecule was also considered to be important for the formation of the stable alpha-phase, as suggested by FT-IR spectroscopy. Further, in the presence of water, the three artificial SC lipids, SLE/CEOS (1/1 mole), SLE/stearic acid/cholesterol (1/1/1 mole), and SLE/stearic acid (1/1 mole), were all capable of forming lamellar structures. Copyright 1997 Academic Press. Copyright 1997Academic Press
Mizushima; Fukasawa; Suzuki
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Publication Detail:
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  195     ISSN:  1095-7103     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  1997 Nov 
Date Detail:
Created Date:  1998-01-26     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  156-63     Citation Subset:  -    
Wakayama Research Laboratories, Kao Corporation, 1334 Minato, Wakayama, 640, Japan
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