GM大豆粉碎膨化工艺参数的优选

试验以美国转基因大豆为原料,研究了粉碎过程中不同水分含量(13.21%、14.82%、16.71%)和筛孔直径(2.02、.53、.0、3.5 mm)对粉碎产品粒度的影响和不同挤压膨化温度(130、140、150℃)、不同粒度和不同水分含量对膨化大豆中脲酶活性和蛋白质溶解度的影响,筛选出加工膨化大豆的最优工艺条件。研究结果表明,大豆粉碎粒度随水分含量和筛孔孔径的增大而增大;大豆最佳挤压膨化加工参数为:水分含量13.21%,筛网孔径3.5mm,膨化温度130℃。在此加工参数条件下,膨化全脂大豆的脲酶活性为0.248 U/g,蛋白质溶解度75.52%。

Optimization of grinding and extrusion conditions for GM soybean

Using USA GM soybean as the material,this study investigated influence of different moisture contents(13.21%、14.82%、16.71%),different hole sizes of hammer mill screen(2.0、2.5、3.0、3.5 mm) on the grinding particle size,and the influence on activity of urease and protein solubility of extruded fullfat soybean meal under different extrusion temperatures,different average geometric particle sizes and moisture contents.The results indicated that the particle size of ground soybean goes larger as the increment of moisture content and screen hole diameter.The optimum extrusion parameters are: moisture content 13.21%,screen hole diameter 3.5 mm and extrusion temperature 130 ℃.Under this condition,urease activity of extruded soybean is 0.248 U/g and the protein solubility is 75.52%.