A Modified Maxwell and a Nonexponential Model for Characterization of the Stress Relaxation of Agar and Alginate Gels

A. NUSSINOVITCH*, M. PELEG, M. D. NORMAND

*Corresponding author for this work

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Abstract

Compressive stress relaxation curves of agar and alginate gels of different gum concentration (1–3% and 0.5–2%, respectively) were fitted by a two parameter nonexponential empirical model and a three term modified Maxwell model with two fixed relaxation times (10 and 100s). The asymptotic portion of the residual (unrelaxed) stress calculated by the two models for each gel had a similar magnitude, and therefore could serve as an objective measure of the gels degree of solidity. The coefficients of the modified Maxwell model provided a simple but meaningful means to compare, in quantitative terms, the differences in the relaxation time spectra that were associated with the gels' stiffness and strength.

Original languageEnglish
Pages (from-to)1013-1016
Number of pages4
JournalJournal of Food Science
Volume54
Issue number4
DOIs
StatePublished - Jul 1989
Externally publishedYes

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