Multilamellarity, structure and hydration of extruded POPC vesicles by SANS

Herbert Schmiedel, L. Almásy, Gotthard Klose

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The small-angle neutron scattering (SANS) data of 12 1-palmitoyl-2-oleoyl- sn-glycero-3-phosphocholine (POPC) dispersions at low lipid concentration (1 mg per 100-mg heavy water) prepared by 5, 9 and 29 extrusions through filters of pores with 50, 100, 200 and 400 nm diameter are presented. They were analyzed within a theory that permits the determination of both structural and hydration parameters of the bilayers as well as the portions of multilamellar vesicles in dispersions with negligible long-range order between the vesicles. The scattering length density profile across the bilayers is approximated by assuming a central hydrocarbon core surrounded by a water-accessible coat. It is modeled by two different forms of functions. In the boat model, the scattering length density of the coat changes linearly from core to water, whereas in the strip model it is constant across the water-accessible coat. It was found that the boat model reflects the reality better than the strip model. The decrease of the multilamellar vesicle portions, either with increasing the number of extrusions at same filter size and with decreasing the filter size, was characterized quantitatively.

Original languageEnglish
Pages (from-to)181-189
Number of pages9
JournalEuropean Biophysics Journal
Volume35
Issue number3
DOIs
Publication statusPublished - Feb 2006

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Small Angle Scattering
Phosphorylcholine
Neutrons
Ships
Water
Deuterium Oxide
Hydrocarbons
Lipids

Keywords

  • Extrusion
  • Multilamellarity
  • POPC
  • SANS
  • Vesicles

ASJC Scopus subject areas

  • Biophysics

Cite this

Multilamellarity, structure and hydration of extruded POPC vesicles by SANS. / Schmiedel, Herbert; Almásy, L.; Klose, Gotthard.

In: European Biophysics Journal, Vol. 35, No. 3, 02.2006, p. 181-189.

Research output: Contribution to journalArticle

Schmiedel, Herbert ; Almásy, L. ; Klose, Gotthard. / Multilamellarity, structure and hydration of extruded POPC vesicles by SANS. In: European Biophysics Journal. 2006 ; Vol. 35, No. 3. pp. 181-189.
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