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29 March 2024
 
  » arxiv » physics/0108023

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Ice Formation in Model Biological Membranes in the Presence of Cryoprotectors
M. A. Kiselev ; P. Lesieur ; A. M. Kisselev ; M. Ollivon ;
Date 14 Aug 2001
Journal Nuclear Instruments & Methods in Physics Research A 448 (2000) 225-260
Subject Biological Physics; Chemical Physics; Medical Physics; Soft Condensed Matter | physics.bio-ph cond-mat.soft physics.chem-ph physics.med-ph
AffiliationJINR, Russia), P. Lesieur (LURE, France), A. M. Kisselev (MIPT, Russia) and M. Ollivon (CNRS, France
AbstractIce formation in model biological membranes is studied by SAXS and WAXS in the presence of cryoprotectors: dimethyl sulfoxide and glycerol. Three types of phospholipid membranes: DPPC, DMPC, DSPC are chosen for the investigation as well-studied model biological membranes. A special cryostat is used for sample cooling from 14.1C to -55.4C. The ice formation is only detected by WAXS in binary phospholipid/water and ternary phospholipid/cryoprotector/water systems in the condition of excess solvent. Ice formation in a binary phospholipid/water system creates an abrupt decrease of the membrane repeat distance by delta-d, so-called ice-induced dehydration of intermembrane space. The value of delta-d decreases as the cryoprotector concentration increases. The formation of ice does not influence the membrane structure (delta-d = 0) for cryoprotector mole fractions higher than 0.05.
Source arXiv, physics/0108023
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