^1H NMR and Rheological Studies of the Calcium Induced Gelation Process in Aqueous Low Methoxyl Pectin Solutions

• Authors: M. Dobies , S. Kuśmia , S. Jurga
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

82.70.Gg; 87.15.By; 87.15.Rn; 82.56.-b; 87.15.He; 83.10.-y; 87.15.La

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: Acta Physica Polonica A
• Year: 2005
• Volume: 108
• Issue: 1
• Pages: 33-46

Dates

published

2005-07

received

2005-04-24

Contributors

author

M. Dobies

• Department of Macromolecular Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

S. Kuśmia

• Department of Macromolecular Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

S. Jurga

• Department of Macromolecular Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

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Identifiers

DOI

10.12693/APhysPolA.108.33