Effect of Jujube Powder Addition on Dough Characteristics and Steamed Bread Quality

In order to study the effect of red jujube flour on dough properties and steamed bread quality,the suitable flour blending ratio of red jujube and wheat was determined. The effects of different proportions of red jujube powder(0,5%,10%,15%)on the physical and chemical properties,color difference,microstructure and flour tensile properties of the mixed flour,as well as on the specific volume,color difference,texture and sensory quality of steamed bread were discussed. The results showed that with the increase of the amount of jujube powder,the contents of water,protein and fat in the mixed powder gradually decreased,while the contents of ash and reducing sugar increased gradually,and the color of the mixed flour and steamed bread gradually turned red and darkened. The water absorption of dough decreased gradually,the formation time and stable time increased at first and then decreased,and the weakening degree decreased at first and then increased. With the addition of different proportions of red jujube flour dough and the extension of waking time(45,90,135 min),the tensile energy,maximum tensile resistance and stretching ratio of the dough showed an overall upward trend. The microstructure of the dough showed that the gluten protein structure was gradually destroyed with the increase of the amount of jujube flour. The specific volume of steamed bread was significantly higher than that of the control group when the addition amount of red jujube powder was in the range of 5%~10%,the specific volume of steamed bread was significantly higher than that of the control group(P<0.05). The elasticity and resilience of steamed bread gradually decreased with the addition of red jujube powder. Sensory evaluation showed that the addition of red jujube powder in the range of 5%~10%,the overall score was higher than the control group steamed bread and easy to be accepted by people. Based on the comprehensive analysis of the effects of jujube powder on dough properties,texture and sensory evaluation of steamed bread,it was determined that the addition amount of jujube powder should not exceed 10%.