A pulsed NMR study of lipids, bound water and sodium ions in macroscopically-oriented lecithin/water lyotropic liquid crystal model membrane systems
The temperature and orientation dependence of pulsed NMR 'free induction decay' signals have been studied in detail for lipid bilayers macroscopically-oriented between glass slides. Results for the lipid molecules ( 1 H, 31 P), bound water ( 2 H 2 O) and ions dissolved in the aqueous phase...
Published in: | Chemistry and Physics of Lipids |
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Elsevier Ireland Ltd.
1979
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ftqueensland:oai:eprints.qut.edu.au:240961 2024-02-04T10:00:02+01:00 A pulsed NMR study of lipids, bound water and sodium ions in macroscopically-oriented lecithin/water lyotropic liquid crystal model membrane systems Pope, J. M. Cornell, B. A. 1979-04 https://eprints.qut.edu.au/240961/ unknown Elsevier Ireland Ltd. doi:10.1016/0009-3084(79)90093-8 Pope, J. M. & Cornell, B. A. (1979) A pulsed NMR study of lipids, bound water and sodium ions in macroscopically-oriented lecithin/water lyotropic liquid crystal model membrane systems. Chemistry and Physics of Lipids, 24(1), pp. 27-43. https://eprints.qut.edu.au/240961/ Elsevier/North-Holland Scientific Publishers Ltd. This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au Chemistry and Physics of Lipids Contribution to Journal 1979 ftqueensland https://doi.org/10.1016/0009-3084(79)90093-8 2024-01-09T00:13:00Z The temperature and orientation dependence of pulsed NMR 'free induction decay' signals have been studied in detail for lipid bilayers macroscopically-oriented between glass slides. Results for the lipid molecules ( 1 H, 31 P), bound water ( 2 H 2 O) and ions dissolved in the aqueous phase ( 23 Na) are presented. Bilayers of egg-lecithin, dimyristoyl lecithin and potassium oleate have been investigated. In the liquid crystal phase all the signals, including those from bound water and ions exhibit a |3 cos 2 φ{symbol} - 1| dependence on orientation of the bilayer normal to the magnetic field. In the case of DML samples, some orientation dependence of both 1 H and 2 H signals persists in the gel phase, indicating that the lipid molecules retain a degree of reorientational freedom about their long axes in this phase. At the gel-liquid crystal transition the 2 H quadrupole spittings undergo a discontinuous change. Results are interpreted in terms of a model in which water molecules are bound to individual lipid head groups and reorient with them, while sodium ions are located in the aqueous channel between bilayers. Article in Journal/Newspaper DML Queensland University of Technology: QUT ePrints Chemistry and Physics of Lipids 24 1 27 43 |
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Queensland University of Technology: QUT ePrints |
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ftqueensland |
language |
unknown |
description |
The temperature and orientation dependence of pulsed NMR 'free induction decay' signals have been studied in detail for lipid bilayers macroscopically-oriented between glass slides. Results for the lipid molecules ( 1 H, 31 P), bound water ( 2 H 2 O) and ions dissolved in the aqueous phase ( 23 Na) are presented. Bilayers of egg-lecithin, dimyristoyl lecithin and potassium oleate have been investigated. In the liquid crystal phase all the signals, including those from bound water and ions exhibit a |3 cos 2 φ{symbol} - 1| dependence on orientation of the bilayer normal to the magnetic field. In the case of DML samples, some orientation dependence of both 1 H and 2 H signals persists in the gel phase, indicating that the lipid molecules retain a degree of reorientational freedom about their long axes in this phase. At the gel-liquid crystal transition the 2 H quadrupole spittings undergo a discontinuous change. Results are interpreted in terms of a model in which water molecules are bound to individual lipid head groups and reorient with them, while sodium ions are located in the aqueous channel between bilayers. |
format |
Article in Journal/Newspaper |
author |
Pope, J. M. Cornell, B. A. |
spellingShingle |
Pope, J. M. Cornell, B. A. A pulsed NMR study of lipids, bound water and sodium ions in macroscopically-oriented lecithin/water lyotropic liquid crystal model membrane systems |
author_facet |
Pope, J. M. Cornell, B. A. |
author_sort |
Pope, J. M. |
title |
A pulsed NMR study of lipids, bound water and sodium ions in macroscopically-oriented lecithin/water lyotropic liquid crystal model membrane systems |
title_short |
A pulsed NMR study of lipids, bound water and sodium ions in macroscopically-oriented lecithin/water lyotropic liquid crystal model membrane systems |
title_full |
A pulsed NMR study of lipids, bound water and sodium ions in macroscopically-oriented lecithin/water lyotropic liquid crystal model membrane systems |
title_fullStr |
A pulsed NMR study of lipids, bound water and sodium ions in macroscopically-oriented lecithin/water lyotropic liquid crystal model membrane systems |
title_full_unstemmed |
A pulsed NMR study of lipids, bound water and sodium ions in macroscopically-oriented lecithin/water lyotropic liquid crystal model membrane systems |
title_sort |
pulsed nmr study of lipids, bound water and sodium ions in macroscopically-oriented lecithin/water lyotropic liquid crystal model membrane systems |
publisher |
Elsevier Ireland Ltd. |
publishDate |
1979 |
url |
https://eprints.qut.edu.au/240961/ |
genre |
DML |
genre_facet |
DML |
op_source |
Chemistry and Physics of Lipids |
op_relation |
doi:10.1016/0009-3084(79)90093-8 Pope, J. M. & Cornell, B. A. (1979) A pulsed NMR study of lipids, bound water and sodium ions in macroscopically-oriented lecithin/water lyotropic liquid crystal model membrane systems. Chemistry and Physics of Lipids, 24(1), pp. 27-43. https://eprints.qut.edu.au/240961/ |
op_rights |
Elsevier/North-Holland Scientific Publishers Ltd. This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au |
op_doi |
https://doi.org/10.1016/0009-3084(79)90093-8 |
container_title |
Chemistry and Physics of Lipids |
container_volume |
24 |
container_issue |
1 |
container_start_page |
27 |
op_container_end_page |
43 |
_version_ |
1789965122456780800 |