Abstract
Abstract Rheological properties of anghouzeh gum, the exudate polysaccharides of Ferula asafoetida, was investigated. For this purpose, anghouzeh gum was extracted from crude exudate by alcoholic extraction with 90% ethanol. The molecular weight of the anghouzeh gum was determined by gel permeation chromatography (GPC). Anghouzeh gum had smaller molecular weight and lower intrinsic viscosity than arabic gum. The intrinsic viscosity was determined by extrapolating Huggins and Kraemer equations to zero concentration. The obtained intrinsic viscosity was 0.213 dl/g. The viscosity of the anghouzeh gum solution was very close to that of albizia gum. Newtonian plateau was seen in low shear rates while a weak shear thinning behavior was observed in higher shear rates. The frequency sweep test showed that in 3% gum solutions the loss modulus (G") was greater than the storage modulus (G') at low frequencies and then it became lower than G' with increasing of frequency. However, critical point was located at very high frequencies.
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