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Hydration dependence of molecular mobility in phospholipid bilayers
This item is provided by the institution :
National Technical University of Athens
Repository :
Digital Library of National Technical University of Athens | Dspace@NTUA
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ΕΚΤ item type
Journal part
(EN)
Scientific article
(EN)
EKT year
1993
(EN)
EKT historical period
Title
Hydration dependence of molecular mobility in phospholipid bilayers (EN)
Creator
Enders, A (EN)
Pissis, P (EN)
Nimtz, G (EN)
Description
Dielectric measurements on di-myristoil-phosphatidylcholine (DMPC)-water bilayers at different water contents up to 0.50 w/w (dry basis) corresponding to approximately 18 mol of water per mol of DMPC by means of the thermally stimulated depolarization currents (TSDC) method in the temperature range 77-320 K show three broad peaks. For fully hydrated samples the peaks are at about 140, 210 and 230 K. Using special peak resolving thermal sampling and partial heating techniques the complex thermograms were analyzed and the spectra of activation energies were determined. In the order of increasing temperature the peaks were attributed to the relaxation of loosely bound water molecules, the rotation of the head groups and, tentatively, space charge polarization. The measurements show that water in excess of 0.08 corresponding to 3 mol of water per mol of DMPC forms clusters, in agreement with the results of water adsorption isotherms measurements. © 1993. (EN)
Type
journalArticle (EN)
Subject
DYNAMIC PROPERTIES (EN)
FROZEN AQUEOUS-SOLUTIONS (EN)
TEMPERATURES (EN)
GLUCOSE (EN)
MEMBRANES (EN)
WATER MULTILAYERS (EN)
SYSTEMS (EN)
TIME (EN)
Physics, Atomic, Molecular & Chemical (EN)
DIELECTRIC-RELAXATION (EN)
DEPOLARIZATION THERMOCURRENTS (EN)
Chemistry, Physical (EN)
Provider
National Technical University of Athens
Repository / collection
Digital Library of National Technical University of Athens | Dspace@NTUA
Subcollections
Κεντρική Βιβλιοθήκη Ε.Μ.Π.
Ιδρυματικό Αποθετήριο
Δημοσιεύσεις μελών Δ.Ε.Π. σε περιοδικά
Journal
Chemical Physics (EN)
Language
English
Issued
1993 (EN)
Identifier
http://hdl.handle.net/123456789/10971
0301-0104 (EN)
1-2 (EN)
ISI:A1993KV22300025 (EN)
171 (EN)
292 (EN)
285 (EN)
Publisher
ELSEVIER SCIENCE BV (EN)
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