Effect of Concentration and Temperature on Flow Properties of Alyssum homolocarpum Seed Gum Solutions: Assessment of Time Dependency and Thixotropy |
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Authors: | Arash Koocheki Seyed M A Razavi |
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Institution: | (1) Department of Food Science and Technology, Ferdowsi University of Mashhad (FUM), PO Box 91775-1163, Mashhad, Iran |
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Abstract: | Effects of different shear rates (14, 25, and 50 s−1), gum concentrations (3%, 3.5%, and 4%), and temperatures (5–65 °C) on flow properties of Alyssum homolocarpum seed gum solutions were investigated using a rotational viscometer. The experimental data were fitted with three time-dependent
rheological models, namely second-order structural kinetic model, Weltman model, and first-order stress decay model with a
non-zero stress value. The rate constant and extent of viscosity strongly depended on the shear rate, gum concentration, and
temperature. It was found that A. homolocarpum seed gum samples exhibited shear thinning and thixotropic behavior for all concentrations and temperatures. The amount of
structural breakdown decreased with shear rate, but it did not have a general trend with concentration and temperature. The
extent of thixotropy increased with increasing gum concentration and decreased with increasing temperature and shear rate.
In this work, the decay rate constant generally increased with increasing shear rate; however, it did not have any trend with
concentration and temperature. |
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Keywords: | |
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