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The target of present study was production of functional low-fat yogurt fortified with flaxseed flour. The effect of different concentrations of flaxseed flour (0.5, 1 and 1.5%) during different storage time (1, 7, 14, 21 days) have been studied on physicochemical, microbial and sensory properties of Low fat yogurt. The results showed that increasing in flaxseed flour had no significant effect on pH, acidity and peroxide value while significantly synergies and dry matter increased and pH and viscosity decreased. With increasing in storage time, dry matter and Acidity increased, while pH and viscosity decreased. Peroxide values increased significantly during storage of yogurt samples. Different levels of flaxseed flour had no significant effect on mold and yeast counts, while it has showed significant increase with increasing in storage time. Regarding to sensory properties, the most scores were obtained for control and with 0.5% flaxseed flour samples. while scores were reduced during storage. Regarding to nutritional properties of flaxseed flour and including essential fatty acids, addition of 0.5% flaxseed flour with preserving chemical and physical properties can help to produce functional low fat yogurt.

Keywords: Flaxseed flour, low fat yogurt, Functional, Fortification

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