Prehistory in the pretransition range of dipalmitoylphosphatidylcholine/water system

Attila Bóta, Manfred Kriechbaum

Research output: Contribution to journalConference article

10 Citations (Scopus)

Abstract

Transitional states in multilamellar fully hydrated dipalmitoylphosphatidylcholine (DPPC) liposomes were studied by using small and wide angle X-ray scattering. The incubation technique was applied to achieve conditions as close as possible to equilibrium. The structures formed in the wide temperature range (30-37 °C) of the pretransition are very different depending on the starting temperatures, 28 and 38 °C, respectively. The difference weakens with time but does not completely vanish even after one week of incubation. The parent phases, the gel (Lβ′) and the rippled gel (Pβ′) are present in the whole temperature range. The amounts of the phases do not change during the pretransition simultaneously. When the samples are cooled down from the narrower transitional temperature range, a previously existing Lβ′, with destroyed layer structure is reformed. However, when heated from this stage up to above the transitional temperature into the phase Pβ′, a more disordered layer structure is formed. This complex thermal prehistory can be interpreted by a memory effect with respect to the one-dimensional lattice structure. The present work has revealed that the structures formed in the critical transition temperature domain produce extreme variety and this feature may have importance in the regulation of membrane transport properties.

Original languageEnglish
Pages (from-to)441-448
Number of pages8
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume141
Issue number3
DOIs
Publication statusPublished - Nov 15 1998
EventProceedings of the 1996 7th Conference on Colloid Chemistry in Memoriam to A. Buzagh - Eger, Hung
Duration: Sep 23 1997Sep 26 1997

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Keywords

  • Liposome
  • Memory
  • Phase transition

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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