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Global small‐angle X‐ray scattering data analysis for multilamellar vesicles: the evolution of the scattering density profile model
Author(s) -
Heftberger Peter,
Kollmitzer Benjamin,
Heberle Frederick A.,
Pan Jianjun,
Rappolt Michael,
Amenitsch Heinz,
Kučerka Norbert,
Katsaras John,
Pabst Georg
Publication year - 2014
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576713029798
Subject(s) - bilayer , vesicle , scattering , neutron scattering , deuterium , small angle neutron scattering , lipid bilayer , neutron , small angle scattering , biological small angle scattering , crystallography , materials science , chemistry , chemical physics , molecular physics , optics , membrane , physics , nuclear physics , biochemistry
The highly successful scattering density profile (SDP) model, used to jointly analyze small‐angle X‐ray and neutron scattering data from unilamellar vesicles, has been adapted for use with data from fully hydrated, liquid crystalline multilamellar vesicles (MLVs). Using a genetic algorithm, this new method is capable of providing high‐resolution structural information, as well as determining bilayer elastic bending fluctuations from standalone X‐ray data. Structural parameters such as bilayer thickness and area per lipid were determined for a series of saturated and unsaturated lipids, as well as binary mixtures with cholesterol. The results are in good agreement with previously reported SDP data, which used both neutron and X‐ray data. The inclusion of deuterated and non‐deuterated MLV neutron data in the analysis improved the lipid backbone information but did not improve, within experimental error, the structural data regarding bilayer thickness and area per lipid.