PFG-NMR diffusometry: a tool for investigating the structure and dynamics of noncommercial purified pig gastric mucin in a wide range of concentrations

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PFG-NMR diffusometry: a tool for investigating the structure and dynamics of noncommercial purified pig gastric mucin in a wide range of concentrations

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Publication Article, peer reviewed scientific
Title PFG-NMR diffusometry: a tool for investigating the structure and dynamics of noncommercial purified pig gastric mucin in a wide range of concentrations
Author(s) Davies, Julia ; Lafitte, Geraldine ; Turesson, Christer ; Söderman, Olle
Date 2007
English abstract
For the first time, Pulsed Field Gradient-Nuclear Magnetic Resonance, a powerful noninvasive tool for studying the dynamics and structure of complex gels, has been used to measure diffusion of probe molecules in aqueous solutions/gels of noncommercial purified pig gastric mucin (PGM), in a concentration range up to 5 wt %. Complementary data were obtained from rheology measurements. The combination of techniques revealed a strong pH dependency of the structure of the PGM samples while changes in concentration, ionic strength, and temperature appeared to induce less pronounced alterations. Viscosity was found to vary in a nonmonotonous way with pH, with the more viscous solutions found at intermediate pH. We propose that this finding is due to a reduced charge density at lower pH, which is expected to continuously increase the relative importance of hydrophobic associations. The results suggest a loose network of expanded fully charged PGM molecules with considerable mobility at neutral pH (pH 7.4). At intermediate pH (pH 4), a three-dimensional expanded network is favored. At pH 1, the charge density is low and microphase separation occurs since hydrophobic associations prevail. This leads to the formation of clusters concentrated in PGM molecules separated by regions depleted in PGM. The results obtained increase our knowledge about the gastric mucosal layer, which in vivo contains mucin in the same concentration range as that of the samples investigated here.
DOI http://dx.doi.org/10.1002/bip.20717 (link to publisher's fulltext)
Link http://www3.interscience.wiley.com/cgi-bin/fulltext/114174235/PDFSTART (external link to publication)
Publisher Wiley
Host/Issue Bioploymers
Volume 86
Pages 165-175
Language eng (iso)
Subject(s) Sciences
Research Subject Categories::MEDICINE::Chemistry::Biochemistry
Research Subject Categories::NATURAL SCIENCES::Chemistry::Physical chemistry::Biophysical chemistry
Handle http://hdl.handle.net/2043/4705 (link to this page)

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