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Self-diffusion of nonfreezing water in porous carbohydrate polymer systems studied with nuclear magnetic resonance

Topgaard, Daniel LU and Söderman, Olle LU (2002) In Biophysical Journal 83(6). p.3596-3606
Abstract
Water is an integral part of the structure in biological porous materials such as wood and starch. A problem often encountered in the preparation of samples for, e.g., electron microscopy is that removal of water leads to a decreasing distance between supermolecular structural elements and a distortion of the structure. It is, therefore, of interest to find methods to investigate these materials in the native water-swollen state. We present a method to study water-swollen biological porous structures using NMR to determine the amount and self-diffusion of water within the porous objects. The contribution of bulk water to the NMR signal is eliminated by performing experiments below the bulk freezing temperature. Further decrease of the... (More)
Water is an integral part of the structure in biological porous materials such as wood and starch. A problem often encountered in the preparation of samples for, e.g., electron microscopy is that removal of water leads to a decreasing distance between supermolecular structural elements and a distortion of the structure. It is, therefore, of interest to find methods to investigate these materials in the native water-swollen state. We present a method to study water-swollen biological porous structures using NMR to determine the amount and self-diffusion of water within the porous objects. The contribution of bulk water to the NMR signal is eliminated by performing experiments below the bulk freezing temperature. Further decrease of the temperature leads to a gradual freezing of water within the porous objects. The contribution of

he freezing water fraction to the migration of water through the porous network is, thus, estimated. The results are rationalized in terms of the ultrastructure of the samples studied, namely, wood pulp fibers and potato starch granules. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Biophysical Journal
volume
83
issue
6
pages
3596 - 3606
publisher
Cell Press
external identifiers
  • wos:000180256300063
  • pmid:12496127
  • scopus:0036927592
ISSN
1542-0086
language
English
LU publication?
yes
id
77407c93-9235-4089-b873-3f7e377b738e (old id 122242)
alternative location
http://www.biophysj.org/cgi/content/abstract/83/6/3596
date added to LUP
2007-07-12 13:20:14
date last changed
2017-05-28 03:30:18
@article{77407c93-9235-4089-b873-3f7e377b738e,
  abstract     = {Water is an integral part of the structure in biological porous materials such as wood and starch. A problem often encountered in the preparation of samples for, e.g., electron microscopy is that removal of water leads to a decreasing distance between supermolecular structural elements and a distortion of the structure. It is, therefore, of interest to find methods to investigate these materials in the native water-swollen state. We present a method to study water-swollen biological porous structures using NMR to determine the amount and self-diffusion of water within the porous objects. The contribution of bulk water to the NMR signal is eliminated by performing experiments below the bulk freezing temperature. Further decrease of the temperature leads to a gradual freezing of water within the porous objects. The contribution of <br/><br>
he freezing water fraction to the migration of water through the porous network is, thus, estimated. The results are rationalized in terms of the ultrastructure of the samples studied, namely, wood pulp fibers and potato starch granules.},
  author       = {Topgaard, Daniel and Söderman, Olle},
  issn         = {1542-0086},
  language     = {eng},
  number       = {6},
  pages        = {3596--3606},
  publisher    = {Cell Press},
  series       = {Biophysical Journal},
  title        = {Self-diffusion of nonfreezing water in porous carbohydrate polymer systems studied with nuclear magnetic resonance},
  volume       = {83},
  year         = {2002},
}