Deuteron spectroscopy and deuteron field-cycling nuclear magnetic resonance relaxometry of the hydration water of lipid bilayers: The corrugated-sheet model for interface molecular dynamics in the ripple phase

Citation
Ro. Seitter et al., Deuteron spectroscopy and deuteron field-cycling nuclear magnetic resonance relaxometry of the hydration water of lipid bilayers: The corrugated-sheet model for interface molecular dynamics in the ripple phase, J CHEM PHYS, 112(19), 2000, pp. 8715-8722
Citations number
26
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF CHEMICAL PHYSICS
ISSN journal
0021-9606 → ACNP
Volume
112
Issue
19
Year of publication
2000
Pages
8715 - 8722
Database
ISI
SICI code
0021-9606(20000515)112:19<8715:DSADFN>2.0.ZU;2-O
Abstract
Lipid bilayers are known to form the so-called ripple phase in a certain te mperature interval between the gel and the liquid crystalline phase transit ions. The dynamics of heavy water at the corrugated water/lipid interface w as studied with the aid of field-cycling nuclear magnetic resonance (NMR) r elaxometry and NMR spectroscopy of the water deuterons. Based on the "reori entation mediated by translational displacement" relaxation mechanism, mode l calculations were carried out. It is shown that the features of the spin- lattice relaxation dispersion and the coalescence of the deuteron quadrupol e splitting in the ripple phase commonly are a consequence of the geometric al surface topology. The deuteron splitting and T-1 dispersion data for the ripple phase can be explained in complete accordance with the results of f reeze etching electron microscopy and tunneling microscopy. That is, the st ructural surface features are mirrored in the reorientational dynamics of h ydration water. (C) 2000 American Institute of Physics. [S0021- 9606(00)511 18-0].