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Effect of casein concentration in suspensions and gels on poly(ethylene glycol)s NMR self-diffusion measurements

Colsenet, Roxane LU ; Söderman, Olle LU and Mariette, F (2005) In Macromolecules 38(22). p.9171-9179
Abstract
PFG-NMR spectroscopy was used to study the diffusion of molecular probes (poly(ethylene glycol)s) in casein suspensions and gels in terms of the effects of probe molecular size (molecular mass between 1080 and 634 000 g/mol), casein concentrations (from 3.24 to 16.22 g/100 g), and effects of rennet coagulation. A strong dependency of diffusion on probe size was observed, both in casein suspensions and in gels: as the PEG size increased, the diffusion was reduced. This effect was more pronounced for higher casein concentrations. Changes in casein structure after addition of rennet increased the diffusion coefficient for 82 250 and 634 000 g/mol PEG. The PEG self-diffusion coefficients in casein gels were compared to the casein gel... (More)
PFG-NMR spectroscopy was used to study the diffusion of molecular probes (poly(ethylene glycol)s) in casein suspensions and gels in terms of the effects of probe molecular size (molecular mass between 1080 and 634 000 g/mol), casein concentrations (from 3.24 to 16.22 g/100 g), and effects of rennet coagulation. A strong dependency of diffusion on probe size was observed, both in casein suspensions and in gels: as the PEG size increased, the diffusion was reduced. This effect was more pronounced for higher casein concentrations. Changes in casein structure after addition of rennet increased the diffusion coefficient for 82 250 and 634 000 g/mol PEG. The PEG self-diffusion coefficients in casein gels were compared to the casein gel structures characterized by scanning electron microscopy. Assuming high internal micelle porosity, a diffusion model with two diffusion pathways, one outside and one inside the micelles, was used to explain the PEG diffusion in casein solutions and gels. The results were discussed in the context of variations in casein micelle voluminosity after renneting. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Macromolecules
volume
38
issue
22
pages
9171 - 9179
publisher
The American Chemical Society
external identifiers
  • wos:000232975900029
  • scopus:27744504441
ISSN
0024-9297
DOI
10.1021/ma051294h
language
English
LU publication?
yes
id
900fd6ae-704b-46d5-b7e0-27b7b1880ae3 (old id 157283)
date added to LUP
2007-07-11 09:10:28
date last changed
2017-01-01 04:19:55
@article{900fd6ae-704b-46d5-b7e0-27b7b1880ae3,
  abstract     = {PFG-NMR spectroscopy was used to study the diffusion of molecular probes (poly(ethylene glycol)s) in casein suspensions and gels in terms of the effects of probe molecular size (molecular mass between 1080 and 634 000 g/mol), casein concentrations (from 3.24 to 16.22 g/100 g), and effects of rennet coagulation. A strong dependency of diffusion on probe size was observed, both in casein suspensions and in gels: as the PEG size increased, the diffusion was reduced. This effect was more pronounced for higher casein concentrations. Changes in casein structure after addition of rennet increased the diffusion coefficient for 82 250 and 634 000 g/mol PEG. The PEG self-diffusion coefficients in casein gels were compared to the casein gel structures characterized by scanning electron microscopy. Assuming high internal micelle porosity, a diffusion model with two diffusion pathways, one outside and one inside the micelles, was used to explain the PEG diffusion in casein solutions and gels. The results were discussed in the context of variations in casein micelle voluminosity after renneting.},
  author       = {Colsenet, Roxane and Söderman, Olle and Mariette, F},
  issn         = {0024-9297},
  language     = {eng},
  number       = {22},
  pages        = {9171--9179},
  publisher    = {The American Chemical Society},
  series       = {Macromolecules},
  title        = {Effect of casein concentration in suspensions and gels on poly(ethylene glycol)s NMR self-diffusion measurements},
  url          = {http://dx.doi.org/10.1021/ma051294h},
  volume       = {38},
  year         = {2005},
}