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  • a Islamic Azad University, P.O.Box 678, Amol, Iran
  • | b Research Institute of Petroleum Industry, P.O. Box 14115-143, Tehran, Iran
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In this research, simultaneous contribution of long-chain inulin (0–2.34%) and modified starch (0–0.58%) on the physical stability and rheological properties of doogh within 30 days of production was studied. Increased concentration of both hydrocolloids redounded to improvements in physical stability, apparent viscosity, flow behaviour, and viscoelastic properties compared to the control sample. Fitting the data to Herschel—Bulkley model showed a decrease in flow behaviour index, while consistency coefficient (k) increased. Furthermore, for samples containing inulin and starch, G′ was greater than G″, unlike control sample. Indeed, contribution of long-chain inulin at concentrations above 1.18% and modified starch at above 0.3% promote the formation of gel network structure. The expected viscosity increases in the continuous phase in the presence of starch, and also the interactions established between inulin and yoghurt casein aggregates seem to be responsible in the improvement observed in physical characteristics of the product. Among the concentrations studied here, two samples, containing 2% inulin and 0.5% modified starch and 1.18% inulin and 0.58% modified starch, respectively, were recognized as functional doogh samples presenting premier physicochemical and rheological properties.

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