| Literature DB >> 19416724 |
S Deren Guler1, D Dipon Ghosh, Jianjun Pan, John C Mathai, Mark L Zeidel, John F Nagle, Stephanie Tristram-Nagle.
Abstract
The structure and water permeability of bilayers composed of the ether-linked lipid, dihexadecylphosphatidylcholine (DHPC), were studied and compared with the ester-linked lipid, dipalmitoylphosphaditdylcholine (DPPC). Wide angle X-ray scattering on oriented bilayers in the fluid phase indicate that the area per lipid A is slightly larger for DHPC than for DPPC. Low angle X-ray scattering yields A=65.1A(2) for DHPC at 48 degrees C. LAXS data provide the bending modulus, K(C)=4.2x10(-13)erg, and the Hamaker parameter H=7.2x10(-14)erg for the van der Waals attractive interaction between neighboring bilayers. For the low temperature phases with ordered hydrocarbon chains, we confirm the transition from a tilted L(beta') gel phase to an untilted, interdigitated L(beta)I phase as the sample hydrates at 20 degrees C. Our measurement of water permeability, P(f)=0.022cm/s at 48 degrees C for fluid phase DHPC is slightly smaller than that of DPPC (P(f)=0.027cm/s) at 50 degrees C, consistent with our triple slab theory of permeability.Entities:
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Year: 2009 PMID： 19416724 PMCID： PMC2698298 DOI： 10.1016/j.chemphyslip.2009.04.003
Source DB: PubMed Journal: Chem Phys Lipids ISSN： 0009-3084 Impact factor: 3.329