RHEOLOGICAL BEHAVIOUR OF THREE BIOPOLYMER/WATER SYSTEMS, WITH EMPHASIS ON YIELD STRESS AND VISCOELASTIC PROPERTIES |
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| Authors: | AGNES GIBOREAU,GÉ RARD CUVELIER,BERNARD LAUNAY |
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| Affiliation: | Department of Food Science, ENSIA Ecole Nationale Supérieure des Industries Agricoles et Alimentaires 91305 Massy France |
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| Abstract: | Flow and viscoelastic properties of three thickened systems are presented: aqueous solutions of locust bean gum, of xanthan and a dispersion of a crosslinked waxy corn starch. Creep measurements allow investigations at very low shear rates. The existence of a yield stress is discussed. Flow was observed at low shear rates, but the starch paste exhibited pseudo-yield stress behaviour. Dynamic measurements were performed and the relationships between flow curves and mechanical spectra are discussed. |
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