Unified picture for spin-lattice relaxation of lipid bilayers and biomembranes

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Abstract

The present study compares and interprets the 1H, 2H, and 13C spin-lattice (T1) relaxation times of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC), in the liquid crystalline phase, in terms of models for the molecular dynamics of lipid bilayers. The 1H T1 times of the DPPC bilayer hydrocarbon region at two frequencies and 13C T1 data at seven frequencies, for which the relaxation is dipolar in origin, as well as the 2H T 1 data at three frequencies, due to the quadrupolar interaction, can be unified and interpreted in terms of a collective model for order fluctuations. In normalizing the 13C T1 data to the 1H and 2H T1 values, a vibrationally corrected 13C-1H distance parameter of rCH 0=1.14 Å has been assumed, rather than the equilibrium bond length of 1.09 Å. The analysis suggests that the behavior of the individual acyl chain segments of lipid bilayers, in the liquid crystalline phase, is similar to that of molecules in nematic fluids.

Original languageEnglish (US)
Pages (from-to)2832-2836
Number of pages5
JournalThe Journal of Chemical Physics
Volume80
Issue number6
StatePublished - 1983
Externally publishedYes

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Lipid bilayers
Spin-lattice relaxation
spin-lattice relaxation
lipids
Crystalline materials
Liquids
Bond length
Hydrocarbons
Relaxation time
Molecular dynamics
normalizing
liquids
Molecules
Fluids
hydrocarbons
relaxation time
molecular dynamics
fluids
colfosceril palmitate
molecules

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Unified picture for spin-lattice relaxation of lipid bilayers and biomembranes. / Brown, Michael F.

In: The Journal of Chemical Physics, Vol. 80, No. 6, 1983, p. 2832-2836.

Research output: Contribution to journalArticle

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