Volume 80, Number 4, November 2007
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||10 October 2007|
Unbinding of lipid bilayers induced by osmotic pressure in relation to unilamellar vesicle formation
Institute of Materials Structure Science, High Energy Accelerator Research Organization - Oho, Tsukuba, Ibaraki, 305-0801, Japan
2 Department of Physics, Kyoto University - Kitashirakawa-oiwake-cho, Sakyo, Kyoto, 606-8502, Japan
3 Department of Chemistry for Materials, Mie University - Kurimamachiya-cho, Tsu, Mie, 514-8507, Japan
Corresponding author: email@example.com
Accepted: 13 September 2007
Small-angle X-ray scattering and phase-contrast microscopy experiments were performed to investigate the effect of osmotic pressure on vesicle formation in a dioleoyl-phosphatidylcholine (DOPC)/water/NaI system. The multi-lamellar structure of lipid bilayers is unstabilized when a lipid film with a sufficient amount of NaI is hydrated by pure water. It has been confirmed that this phenomenon is due to the effect of osmotic pressure induced by a hetero- geneous distribution of NaI molecules. This could be the origin of the unbinding of lipid bilayers to conform large uni-lamellar vesicles.
PACS: 87.14.Cc – Lipids / 87.16.Dg – Membranes, bilayers, and vesicles / 61.10.Eq – X-ray scattering (including small-angle scattering)
© Europhysics Letters Association, 2007
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