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Structural study of the inverted cubic phases of di-dodecyl alkyl-β-D-glucopyranosyl-rac-glycerol

Turner, David C. and Wang, Zhen-Gang and Gruner, Sol M. and Mannock, David A. and McElhaney, Ronald N. (1992) Structural study of the inverted cubic phases of di-dodecyl alkyl-β-D-glucopyranosyl-rac-glycerol. Journal de Physique II, 2 (11). pp. 2039-2063. ISSN 1155-4312. doi:10.1051/jp2:1992250.

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We present a quantitative study of the bicontinuous cubic phases in the didodecyl alkyl-β-D-glucopyranosyl-rac-glycerol (rac-di-12:0 β-GlcDAG) lipid-water system. A temperature-composition phase diagram determined using X-ray diffraction shows Ia3d and Pn3/Pn3m cubic phase regions in addition to inverted hexagonal (H^(II)) and several lamellar phase regions. The diffraction data was used to determine the lattice repeat vector, d, and, using suitable models, the lipid monolayer thickness, d_L, for all temperatures and compositions in the diagram. The models chosen for the cubic phases were based on lipid bilayers straddling infinitely periodic minimal surfaces (IPMS) as described previously in the literature [1]. Using the structural data derived from the phase diagram, the lyotropic phase transition between the two cubics was modeled by a simple curvature free energy theory. A new result of this theory was an estimate for the Gaussian curvature bending modulus of the lipid monolayer. The model was found to quantitatively describe the phase transition, particularly for phase behavior at low hydration. Our model suggests some universal features should be present in any system that shows non-lamellar phases and we discuss those features with respect to the phase diagrams available in the literature.

Item Type:Article
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Wang, Zhen-Gang0000-0002-3361-6114
Additional Information:© 1992 Les Editions de Physique. Received 3 June 1992, accepted in final form 2 July 1992.
Issue or Number:11
Classification Code:PACS: 61.30E; 64.70M
Record Number:CaltechAUTHORS:20200320-123553945
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Official Citation:Structural study of the inverted cubic phases of di-dodecyl alkyl-β-D-glucopyranosyl-rac-glycerol. David C. Turner, Zhen-Gang Wang, Sol M. Gruner, David A. Mannock et Ronald N. McElhaney. J. Phys. II France, 2 11 (1992) 2039-2063 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102026
Deposited By: Tony Diaz
Deposited On:20 Mar 2020 23:30
Last Modified:16 Nov 2021 18:08

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