以玉米蛋白粉为原料，采用 DS32- Ⅱ型双螺杆挤压膨化机进行挤压膨化，以处理后的蛋白粉为原料提取玉米醇溶蛋白，研究挤压膨化对玉米醇溶蛋白结构及物理性质的影响．结果表明，挤压膨化工艺可使玉米醇溶蛋白的结构特性发生改变，微观结构中蛋白聚集体发生融合，FT- IR光谱中蛋白酰胺带出峰位置与强度发生变化，二级结构中 α 螺旋和 β 转角转化为 β 折叠和无规卷曲，热学性质中蛋白变性温度减小．蛋白的物性研究结果表明，挤压膨化的玉米醇溶蛋白物性得到改善，持水力、吸油性和黏度均有不同程度的增加．

Corn gluten meals were used as source materials to extract zein via the extrusion using a DS32- Ⅱ typetwin- screw extruder,and the effects of extrusion on the structure and physical properties of zein were investigated.The results show that the extrusion may result in the change of structural characteristics of zein; for instance,theprotein aggregates fuse in a certain degree,the position and intensity of the peak of extruded zein amide change inthe FT- IR spectrum,the α- helix and β- turn in the secondary structure turn into β- sheet and random coil,and thedenaturation temperature of zein decreases.Moreover,the extrusion also results in an improvement of physicalproperties of zein in terms of water- holding capacity,oil absorbency and viscosity.