Microdomain formation in model biomembranes

Tomomi Masui, Masayuki Imai, Naohito Urakami

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We have investigated the microdomain formation in small unilamellar vesicles (SUVs) composed of ternary mixture of deuterated DPPC, hydrogenated DOPC and hydrogenated cholesterol using a contrast matching technique of small angle neutron scattering. Above the miscibility temperature we cannot observe the scattering intensity from the SUVs. Thus, DPPC, DOPC and cholesterol are mixed at the molecular level in membranes. However, below the miscibility temperature we observe characteristic scattering profiles with a scattering maximum, which clearly shows that the lateral segregation of lipids takes place. The observed profiles are well described by a model scattering function for a single hemispherical shape domain with the radius of several nm. With decreasing the temperature the scattering intensity increases with keeping their maximum positions, indicating that the domain composition strongly depends on the temperature.

Original languageEnglish
Pages (from-to)821-823
Number of pages3
JournalPhysica B: Condensed Matter
Volume385-386 I
DOIs
Publication statusPublished - 2006 Nov 27
Externally publishedYes

Keywords

  • Contrast matching technique
  • Microdomain
  • Model biomembrane

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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