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The effect of shear rate on the viscosity of solutions of guar gum and locust bean gum
Author(s) -
Elfak Attia M.,
Pass Geoffrey,
Phillips Glyn O.
Publication year - 1979
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740300415
Subject(s) - guar gum , locust bean gum , shear rate , chemistry , viscosity , sugar , relative viscosity , apparent viscosity , aqueous solution , rheology , natural gum , guar , thermodynamics , food science , polysaccharide , organic chemistry , xanthan gum , physics
The apparent viscosities of aqueous solutions of guar gum and locust bean gum have been measured over a range of shear rates from 14 to 1142 s −1 . Comparable measurements were also made on gum solutions to which glucose, sucrose or glucose syrup had been added. For all the solutions the variation of relative viscosity with shear rate fits a power law equation. Addition of sugar has no effect on the non‐Newtonian behaviour of the gum solutions. The relative viscosity of the gum in the sugar solutions is lower than in water. The ratios of the relative viscosities closely correspond with the ratios of the intrinsic viscosities. This is interpreted in terms of a smaller extension of the gum molecule in the sugar solution.