| A pressure-jump time-resolved X-ray diffraction study of cubic-cubic transition kinetics in monoolein. | |
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MedLine Citation:
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PMID: 18257588 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In the past two decades, the geometric pathways involved in the transformations between inverse bicontinuous cubic phases in amphiphilic systems have been extensively theoretically modeled. However, little experimental data exists on the cubic-cubic transformation in pure lipid systems. We have used pressure-jump time-resolved X-ray diffraction to investigate the transition between the gyroid QGII and double-diamond QDII phases in mixtures of 1-monoolein in 30 wt % water. We find for this system that the cubic-cubic transition occurs without any detectable intermediate structures. In addition, we have determined the kinetics of the transition, in both the forward and reverse directions, as a function of pressure-jump amplitude, temperature, and water content. A recently developed model allows (at least in principle) the calculation of the activation energy for lipid phase transitions from such data. The analysis is applicable only if kinetic reproducibility is achieved, at least within one sample, and achievement of such kinetic reproducibility is shown here, by carrying out prolonged pressure-cycling. The rate of transformation shows clear and consistent trends with pressure-jump amplitude, temperature, and water content, all of which are shown to be in agreement with the effect of the shift in the position of the cubic-cubic phase boundary following a change in the thermodynamic parameters. |
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Authors:
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Charlotte E Conn; Oscar Ces; Adam M Squires; Xavier Mulet; Roland Winter; Stephanie M Finet; Richard H Templer; John M Seddon |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-02-08 |
Journal Detail:
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Title: Langmuir : the ACS journal of surfaces and colloids Volume: 24 ISSN: 0743-7463 ISO Abbreviation: Langmuir Publication Date: 2008 Mar |
Date Detail:
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Created Date: 2008-03-12 Completed Date: 2008-05-14 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9882736 Medline TA: Langmuir Country: United States |
Other Details:
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Languages: eng Pagination: 2331-40 Citation Subset: IM |
Affiliation:
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Department of Chemistry, Imperial College London, SW7 2AZ, UK. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Glycerides
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chemistry* Kinetics Pressure Scattering, Small Angle Time Factors X-Ray Diffraction |
| Chemical | |
Reg. No./Substance:
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0/Glycerides; 25496-72-4/monoolein |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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