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A NMR self-diffusion study of the porous structure of starch granules

Topgaard, Daniel LU and Söderman, Olle LU (2002) Conference on Lipid and Polymer-Lipid Systems, 2002 In Progress in Colloid & Polymer Science 120. p.47-51
Abstract
The equilibrium self-diffusion of water contained within the porous structure of three different types of starch, viz. corn, wheat and potato starch was investigated. The samples were exposed to humid air until they reached a certain water content, the value of which was determined from the <sup>1</sup>H NMR free induction decays. The water self-diffusion coefficient was determined by means of a pulsed-field-gradient stimulated-echo experiment. This experiment is susceptible to cross-relaxation effects, i.e. the transfer of longitudinal magnetization during the experiment; therefore, the cross-relaxation process was first quantified by means of Goldman-Shen-type experiments. The water self-diffusion could then be rationalized... (More)
The equilibrium self-diffusion of water contained within the porous structure of three different types of starch, viz. corn, wheat and potato starch was investigated. The samples were exposed to humid air until they reached a certain water content, the value of which was determined from the <sup>1</sup>H NMR free induction decays. The water self-diffusion coefficient was determined by means of a pulsed-field-gradient stimulated-echo experiment. This experiment is susceptible to cross-relaxation effects, i.e. the transfer of longitudinal magnetization during the experiment; therefore, the cross-relaxation process was first quantified by means of Goldman-Shen-type experiments. The water self-diffusion could then be rationalized in terms of a distribution of diffusion coefficients, with an average value much reduced compared to bulk water. No dependence on the diffusion time in the range from 70 to 340 ms was observed, indicating that there are no impermeable barriers for the diffusion of water on a length scale of microns (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
corn starch, porous structure, nuclear magnetic resonance self-diffusion, starch granules, equilibrium self-diffusion, potato starch, pulsed-field-gradient stimulated-echo experiment, cross-relaxation effects, longitudinal magnetization, plants, Goldman-Shen-type experiments, storage polysaccharide, humid air, water content, <sup>1</sup>H nuclear magnetic resonance free induction decays, water self-diffusion coefficient, wheat starch
in
Progress in Colloid & Polymer Science
volume
120
pages
47 - 51
publisher
Springer
conference name
Conference on Lipid and Polymer-Lipid Systems, 2002
external identifiers
  • wos:000177564900007
  • other:CODEN: PCPSD7
  • scopus:0036955120
ISSN
0340-255X
language
English
LU publication?
yes
id
8835df12-ea27-4611-8513-c027c812f414 (old id 611687)
date added to LUP
2007-11-29 11:04:40
date last changed
2017-07-02 04:15:43
@inproceedings{8835df12-ea27-4611-8513-c027c812f414,
  abstract     = {The equilibrium self-diffusion of water contained within the porous structure of three different types of starch, viz. corn, wheat and potato starch was investigated. The samples were exposed to humid air until they reached a certain water content, the value of which was determined from the &lt;sup&gt;1&lt;/sup&gt;H NMR free induction decays. The water self-diffusion coefficient was determined by means of a pulsed-field-gradient stimulated-echo experiment. This experiment is susceptible to cross-relaxation effects, i.e. the transfer of longitudinal magnetization during the experiment; therefore, the cross-relaxation process was first quantified by means of Goldman-Shen-type experiments. The water self-diffusion could then be rationalized in terms of a distribution of diffusion coefficients, with an average value much reduced compared to bulk water. No dependence on the diffusion time in the range from 70 to 340 ms was observed, indicating that there are no impermeable barriers for the diffusion of water on a length scale of microns},
  author       = {Topgaard, Daniel and Söderman, Olle},
  booktitle    = {Progress in Colloid & Polymer Science},
  issn         = {0340-255X},
  keyword      = {corn starch,porous structure,nuclear magnetic resonance self-diffusion,starch granules,equilibrium self-diffusion,potato starch,pulsed-field-gradient stimulated-echo experiment,cross-relaxation effects,longitudinal magnetization,plants,Goldman-Shen-type experiments,storage polysaccharide,humid air,water content,<sup>1</sup>H nuclear magnetic resonance free induction decays,water self-diffusion coefficient,wheat starch},
  language     = {eng},
  pages        = {47--51},
  publisher    = {Springer},
  title        = {A NMR self-diffusion study of the porous structure of starch granules},
  volume       = {120},
  year         = {2002},
}