挤压膨化后纤维降解对大豆水酶法提油率的影响

在单因素试验和挤压膨化机稳定工作基础上,采用响应曲面设计研究了挤压膨化工艺参数对水酶法提取大豆油脂得率与纤维降解率的影响.利用SAS软件建立了数学模型,并对各因素及交互作用进行了分析.结果表明:当模孔孔径为20 mm、物料含水率为14.5%、螺杆转速为105 r/min、套筒温度为90℃时,总油提取率最优值为93.02%±0.29%.当模孔孔径为18 mm、物料含水率为15%、螺杆转速为100 r/min、套筒温度为95℃时,纤维降解率最优值为40.28%±0.43%.挤压膨化过程中纤维降解程度对总油提取率影响很大.总油提取率并不完全取决于挤压膨化过程中纤维降解程度.

Effect of Cellulose Degradation on Soybean Oil Extraction Yield through Extrusion and Expansion Processing

Based on single factor experiment, response surface methodology was used and orthogonal experiment was designed to investigate the effect of extruding parameters on soybean oil yield extracted with enzyme-assisted aqueous extraction processing and cellulose degradability after extrusion and expansion. Statistical analysis system (SAS) was employed to establish regression model and interaction of factors was analyzed. Results showed that the optimal total soybean oil yield is 93.02%±0.29% on response surface with the die length of 20 mm, moisture of material of 14.5%, rotate speed for screw of 105 r/min, and sleeve temperature of 90℃. Furthermore, There existences a optimal cellulose degradability value of 40.28%±0.43% on response surface when die length is 18 mm, moisture of meal is 15%, rotate speed of screw is 100 r/min, and sleeve temperature is 95℃. The degree of cellulose degradability has a significant effect on total oil extraction yield during extrusion and expansion period, total oil extraction yield during extrusion and expansion was not only dependent on cellulose degradability.