【摘要】 以挤压机机筒温度、物料含水率、螺杆转速、模孔直径为考察因素,多孔淀粉吸油率为评价指标,通过单因素与响应面试验,经Design-Expert软件处理,建立各因素对指标影响的数值模型,分析模型各因素之间交互作用对指标的影响。试验结果表明,在机筒温度68℃、物料含水率42%、螺杆转速150 r/min、模孔直径12 mm挤压条件下,多孔淀粉吸油率为62.13%,比未经挤压的多孔淀粉吸油率提高29.78%。扫描电镜显示挤压复合酶法制备的多孔淀粉微观结构呈多孔的蜂窝状。更多还原

【Abstract】 Porous starch was produced with corn starch by using extrusion pretreatment before enzymolysis,and the effect of system parameters on oil absorption rate of porous starch were investigated.Barrel temperature,moisture content of material,rotation speed of screw and aperture diameter of extruding machine were considered as factors,the oil absorption rate of porous corn starch was employed as evaluation index.Through the experiment of single factor and response surface experiment,with the aid of Design-Expert,the mathematical model of response factors on the index was established.The effect of interaction between factors of models on index was analyzed.The results indicated that the optimal extrusion conditions were barrel temperature of 68℃,moisture content of material of 42%,screw speed of 150 r/min and the aperture diameter of 12 mm.Under the optimal conditions,the oil absorption rate was 62.13%,and the oil absorption rate had increased by 29.78% compared with that not treated with extrusion.SEM indicated that the microstructure of porous starch was alveolate.更多还原