Nowadays, the rheological and industrial importance of hydrocolloids is completely obvious. Yield stress as one of the most important parameter in their rheological behavior has been discussed for many years. Among the direct and indirect methods used in yield stress measurement, only the direct ones have been noticed and applied in the hydrocolloid rheology. In the present study, the yield stress of two traditional Iranian hydrocolloids known as Salep (Palmate-tuber Orchid), Balangu (Lallemantia royleana) and one commercial hydrocolloid (Locust Bean Gum, LBG) were evaluated using two indirect techniques namely inclined plane and cylindrical penetrometer. These results compared with the viscometery data obtained by flow curve extrapolation based on different visco-plastic models. The applicability of these techniques in hydrocolloid rheology has also been discussed.

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