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Effect of subtransition in 1,2‐dipalmitoylphosphatidylcholine model membrane on the spin probe motion
Author(s) -
Gollová J.,
Balgavý P.
Publication year - 1989
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(89)81120-2
Subject(s) - dipalmitoylphosphatidylcholine , cholestane , chemistry , spin label , rotational correlation time , spin probe , electron paramagnetic resonance , phase (matter) , rotational diffusion , molecule , analytical chemistry (journal) , nuclear magnetic resonance , phosphatidylcholine , membrane , crystallography , stereochemistry , phospholipid , organic chemistry , physics , biochemistry
The effect of subgel → gel phase transition (subtransition) on conventional electron spin resonance spectra of cholestane, fatty acid and alkylammonium‐type spin probes has been studied in aqueous 1,2‐dipalmitoyl‐ sn ‐phosphatidylcholine dispersions. The cooperative onset of the cholestane spin probe rotation about its long axis, with an effective correlation time of 2–3 ns, has been detected at a temperature coinciding with the calorimetric substransition, indicating onset of the host lipid rotational motion. The lipid rotation results in dissolution of the spin probe clusters in the host lipid. In the gel phase, the lateral distribution of impurity molecules is more isotropic than in the subgel phase.