响应面法优化水产饲料的膨化工艺

Optimization of aquatic feed expanding process by response surface method

以鱼粉、棉籽粕为主要原料,通过挤压膨化技术制备水产饲料。根据Central Composite Design中心组合设计原理,运用Design-Expert实验优化软件,采用三因素五水平的响应面分析法,分析了螺杆转速、水分、机筒温度3个因素对产品的物理特性(淀粉糊化度、水中稳定性、含粉率)的影响规律及其交互作用,建立了相应的二次回归模型,优化了水产饲料的膨化工艺。结果表明,最佳的膨化工艺为:螺杆转速为65r/min,水分为27%,机筒温度为125℃。

With fish meal and cottonseed meal as main raw materials, the aquatic feed was prepared by extrusion process. Based on the principle Central Composite Design, method of response surface methodology （RSM） with three factors and five levels combining with Design-Expert experimental optimj,zation software was adopted. Taking physical characteristics （starch gelatinization, water stability, and powder-containing rate） as the evaluation indicators, the effect of screw speed, moisture content, and barrel temperature on physical characteristics was studied. A corresponding quadratic regression model was estab- lished and the aquatic feed expanding process was optimized. The results showed that the optimum expanded condition was as： the screw speed of 65 r/min, the moisture content of 27%, and the barrel temperature of 125℃.