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Abstracts
The ^1H NMR relaxometry in combination with water proton spin-spin relaxation time measurements and rheometry have been applied to study the ionic gelation of 1% w/w aqueous low methoxyl pectin solution induced by divalent Ca^{2+} cations from a calcium chloride solution. The model-free approach to the analysis of ^1H NMR relaxometry data has been used to separate the information on the static (β) and dynamic (〈τ_c〉) behaviour of the systems tested. The ^1H NMR results confirm that the average mobility of both water and the pectin molecules is largely dependent on the concentration of the cross-linking agent. The character of this dependency (β,〈τ_c〉 and T_2 vs. CaCl_2 concentration) is consistent with the two-stage gelation process of low methoxyl pectin, in which the formation of strongly linked dimer associations (in the range of 0-2.5 mM CaCl_2) is followed by the appearance of weak inter-dimer aggregations (for CaCl_2 ≥ 3.5 mM). The presence of the weak gel structure for the sample with 3.5 mM CaCl_2 has been confirmed by rheological measurements. Apart from that, the T_1 and T_2 relaxation times have been found to be highly sensitive to the syneresis phenomenon, which can be useful to monitor the low methoxyl pectin gel network stability.
Discipline
- 83.10.-y: Fundamentals and theoretical
- 87.15.La: Mechanical properties
- 82.70.Gg: Gels and sols
- 82.56.-b: Nuclear magnetic resonance(see also 33.25.+k Nuclear resonance and relaxation in atomic and molecular physics; 76.60.-k Nuclear magnetic resonance and relaxation; 76.70.-r Magnetic double resonances and cross effects in condensed matter)
Journal
Year
Volume
Issue
Pages
33-46
Physical description
Dates
published
2005-07
received
2005-04-24
Contributors
author
- Department of Macromolecular Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
author
- Department of Macromolecular Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
author
- Department of Macromolecular Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv108n104kz