BACKGROUND: Lallemantia royleana with vernacular name of Balangu is a mucilaginous endemic plant which is grown in different regions of world especially Middle East countries. The flow behavior of Balangu seed extract (BSE) and its mixture with xanthan, guar gum and locust bean gum solutions at 1:3, 1:1, and 3:1 in addition to control samples (0% BSE) were evaluated. To describe the rheological properties of solutions, the power law model was fitted on apparent viscosity- shear rate data. To evaluate the interaction between BSE and selected hydrocolloids in dilute solutions, the relative viscosity was investigated vs. BSE fraction (gkg-1). RESULTS: The apparent viscosities of BSE, control sample and their blends were similar to each other at shear rate of 293 s-1. There was no significant difference between the consistency coefficient values of guar and locust bean solutions and their blends substituted by 250 gkg-1 BSE. The statistical comparison indicated that 1:3 and 1:1 ratios of BSE-xanthan solution have consistency index equal to pure xanthan solution. BSE-locust bean gum at all ratios, BSE-xanthan at 1:3 ratio and BSE-guar gum at 1:1 and 3:1 ratios showed relative viscosity lower than values calculated assuming no interaction. The intrinsic viscosity value of BSE was determined 3.50 dL/g. CONCLUSION: At shear rate around 300 s-1, the apparent viscosities of studied hydrocolloids, BSE and their blends were in a limited range and the selected commercial gums can be substituted by 250 gkg-1 and 550 gkg-1 BSE

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