Effects of Adding Concentrated Protein of Bitter Orange Seed on Physical, Chemical and Sensory Properties of Set-Type Yogurt

Abstract

Yogurt is one of the most popular and widely consumed dairy products that it is very important in people's food basket. Thus, the modification and improvement of its technological and nutritional properties has a special place. Aiming to improve nutritional value, syneresis reduction and reach to maximum overall palatability, the set-type yogurt was produced by adding various amount of freeze-dried orange seed protein concentrate at 0, 1, 2 and 3% and physicochemical properties (pH, acidity, syneresis and apparent viscosity) were evaluated at storage days of 1, 7, 14 and 21 at 4 °C. While the apparent viscosity and syneresis of set-type yogurt with no orange seed protein concentrate (control sample) were significantly (P<0.05) increased in the vicinity of 2.8 and 5.5 times during 21 days storage respectively, the noted parameters increased at rates of 5.7 and 4.24 times respectively in yogurt containing 3% of orange seed protein concentrate at the same conditions. While the control sample obtained only 75.5% of its maximum sensory and organoleptic (flavor, aroma, color, and creamy texture) scores, the produced yogurt comprising 3% of orange seed protein concentrate gained up to 93.5% of these attributes that corresponded to52.84% climb in total protein.

Keywords

• apparent viscosity
• bitter orange (citrus aurantium)
• sensory evaluation
• set-type yogurt
• syneresis