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| Lang, E.R. and C. Rha. 1981. Determination of the yield stress of hydrocolloid dispersions. Journal of Texture Studies 12: 47-62. | to Top |
ABSTRACT The yield stresses of dispersions of guar gum (0.5-2.0% by weight) and gelatinized cornstarch (2.5-5.0% by weight) were measured using several different established experimental methods. The yield stresses in these polysaccharide dispersions result from intermolecular hydrogen bonding and molecular entanglements, thus the higher yield stress and hysteresis effect in guar gum dispersion was interpreted in terms of greater hydrogen-bonding density and molecular entanglements caused by the more extended chain conformation. The results confirm that there is no one absolute value for the yield stress of the hydrocolloid dispersions and that the viscoelastic characteristics of the test materials influence the shear rate and time dependence of yield stress. Threfore, experimental determination of yeild stress must be made relevant to the practical application.
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