Journal
FOOD HYDROCOLLOIDS
Volume 23, Issue 4, Pages 1074-1080Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2008.06.011
Keywords
Alginate; Gelatin; Mixed gel; Gelation; Phase separation; Rheology
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Mixtures of alginate and gelatin were studied by rheology as a function of different parameters, such as temperature, biopolymer concentrations, calcium concentration and ionic strength. In particular conditions, the formation of a mixed gel of alginate and gelatin is obtained. A slow release of calcium ions leads first to an irreversible alginate gel and cooling results in a reversible gelatin gel. Depending on experimental conditions, non-linear behaviours upon gelation of alginate occur and a collapse of alginate gel is directly observable by rheology. These trends are favoured between 35 and 45 degrees C, by a high total biopolymer concentration or a high calcium concentration and ionic strength. Different mechanisms could be responsible for this collapse, such as a competition between alginate gelation and phase separation in the biopolymer mixture or an over-association of alginate chains at high Ca2+ concentration, favoured by the presence of gelatin. (C) 2008 Elsevier Ltd. All rights reserved.
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