微细化薯渣粉对小麦面团特性的影响

为研究微细化薯渣粉不同添加量对面团特性的影响,将微细化薯渣粉按不同比例(2%~12%,质量分数)与小麦粉混合制成配粉,测定不同配粉生面团的热机械学特性、质构特性、色泽以及面团结构。结果表明,随着微细化薯渣粉添加量的增加,面团吸水率和稳定时间增加,形成时间、蛋白质弱化度及回生值逐渐减小,峰值黏度、淀粉水解速率、黏度崩解值先减小后增加,当薯渣粉的添加质量分数大于8%时,峰值黏度和淀粉水解速率又逐渐降低;面团硬度、胶着性和咀嚼性逐渐增大,内聚力、回复性呈现先增加后下降的趋势,品质有所降低;面团L^*、a^*和b^*值呈现下降的趋势,颜色发暗,总色差值增大;面团的微观结构显示,薯渣粉的添加会破坏小麦面团中的面筋网状结构,使淀粉颗粒逐渐裸露。综上,微细化薯渣粉的添加会破坏面筋蛋白均匀致密的网络结构,可能是导致面团流变性质改变的原因,但添加质量分数在8%以内,对小麦面团特性的影响较小。

新型甘薯薯渣粉制备工艺优化研究

为改善甘薯薯渣粉的品质,以甘薯薯渣为原料,采用四元二次正交旋转设计研究甘薯薯渣粉碎细度、Na_2S_2O_4浓度、干燥温度、洞道干燥装置载量4个因素对甘薯薯渣粉白度及含水率综合评分的影响,用DPS 7.05软件分析得到回归方程。研究结果表明,新型甘薯薯渣粉最佳工艺条件为:粉碎细度60目、Na_2S_2O_4浓度0.9%、干燥温度80℃、载量64.5%。在此工艺条件下,新型甘薯薯渣粉的白度为75.10%,含水率为2.027%,综合评分达到99.84,持水力为35.60 g/g,持油力为7.77 g/g,溶胀力达119.00 mL/g,优化甘薯薯渣粉部分理化和功能性品质特性得到提高,其白度和持油力性能显著改善,适合应用到油炸食品、松饼、面包制品等食品领域。

Study on Contents of Nutritional Ingredients and Reutilization of Sweet Potato Starch Residue

[Objective] This study aimed to investigate the contents of nutriUonal ingredients and reutilization way of sweet potato starch residue. [Method] The starch residue of Shangshu 19 from four different processing sites was used as the test material, and the contents of main nutritional ingredients and moisture in the sweet potato starch residue were determined. [Result] In the sweet potato starch residue （calculated by fresh weight）, the average contents of moisture, starch, fat, protein, Zn, Fe, Se and Ca were 83.75%, 101.15 g/kg, 0255%, 0.497 3%, 11.18 mg/g, 1 219.00 mg/kg, 0.032 3 mg/kg and 6 460.00 mg/kg, respectively, but Vc, VA and chlorogenic acid were not detected. According to the characteristics of high starch content and abundant nutritional ingredients, the sweet potato starch residue can be used for producing edible alcohol and dietary fiber health food. [Coaclusio,] This study will provide certain reference for fully development and utilization of sweet potato starch residue.