title: The inverse hexagonal - inverse ribbon - lamellar gel phase transition sequence in low hydration DOPC:DOPE phospholipid mixtures.
abstract: The inverse hexagonal to inverse ribbon phase transition in a mixed phosphatidylcholine-phosphatidylethanolamine system at low hydration is studied using small and wide angle X-ray scattering. It is found that the structural parameters of the inverse hexagonal phase are independent of temperature. By contrast the length of each ribbon of the inverse ribbon phase increases continuously with decreasing temperature over a range of 50 degrees C. At low temperatures the inverse ribbon phase is observed to have a transition to a gel lamellar phase, with no intermediate fluid lamellar phase. This phase transition is confirmed by differential scanning calorimetry.
authors.affiliation: Applied Physics, School of Applied Sciences, RMIT University, Melbourne, VIC 3000, Australia.
authors.forename: Ben
authors.initials: B
authors.lastname: Kent
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Garvey
authors.forename: David
authors.initials: D
authors.lastname: Cookson
authors.forename: Gary
authors.initials: G
authors.lastname: Bryant
mesh_terms: D045424:Complex Mixtures / Q000737:chemistry*; D005782:Gels; D044367:Phase Transition; D010713:Phosphatidylcholines / Q000737:chemistry*; D010714:Phosphatidylethanolamines / Q000737:chemistry*; D053838:Scattering, Small Angle; D017356:Synchrotrons; D013696:Temperature; D014867:Water / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: C410262:1,2-dioleoyl-glycero-3-phosphatidyl ethanolamine; D045424:Complex Mixtures; D005782:Gels; D010713:Phosphatidylcholines; D010714:Phosphatidylethanolamines; D014867:Water; C017251:1,2-oleoylphosphatidylcholine