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Cholesterol Binding to the Alkyl Chains of an Intercalated Surfactant Bilayer

Venkatatraman, NV and Vasudevan, S (2003) Cholesterol Binding to the Alkyl Chains of an Intercalated Surfactant Bilayer. In: Journal of Physical Chemistry B, 107 (37). pp. 10119-10126.

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Alkyl-chain bilayers can be formed within the galleries of layered inorganic solids by intercalation of longchain amphiphilic surfactant molecules. It is shown here that cholesterol, normally found in lipid bilayers of biomembranes, can bind to the intercalated bilayer, thereby providing a novel route for the insertion of cholesterol in inorganic solids. The new hybrid material is held together by purely noncovalent, nonionic dispersive forces and is a novel example of supramolecular architecture in the solid state. Additionally, it provides a simple system to understand the nature of cholesterols-hydrocarbon interactions at a molecular level. The rigid sterol ring of the cholesterol is located within the intercalated bilayer and is oriented parallel to the alkyl chains. Its presence affects the conformation of neighboring alkyl chains. An analysis of the methylene progression bands in the infrared spectrum of the intercalated bilayer, with and without cholesterol, indicates that these chains are forced to adopt a rigid, all-trans, planar conformation. Conformational freedom of alkyl chains once-removed appear unaffected.

Item Type: Journal Article
Publication: Journal of Physical Chemistry B
Publisher: American Chemical Society
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 22 May 2007
Last Modified: 19 Sep 2010 04:38
URI: http://eprints.iisc.ac.in/id/eprint/11045

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