玉米粉静态流变特性及成膜特性

对不同的玉米粉粒度、水浴温度、料液比及甘油添加量的玉米粉糊体系的静态流变特性及成膜机械性能进行了研究,并初步探讨了玉米粉糊的流变性能及膜机械性能之间的关系。结果表明:玉米粉糊呈现剪切变稀的假塑性,且黏度会影响触变行为,而触变性最大时所制备的玉米粉膜的抗拉伸强度也最大。玉米粉膜的抗拉伸强度与玉米淀粉膜基本一致。水蒸气透过率和溶解性测试表明,玉米粉膜水蒸气透过率略小于玉米淀粉膜,而溶解性与玉米淀粉膜无显著差异。电镜扫描结果显示,玉米粉膜与玉米淀粉膜表面均较为平整、光滑,表明玉米粉具有良好的成膜特性。

Relationship between Static Rheology and Mechanical Properties of Corn Flour Film Liquid Prepared under Different Conditions

The static rheological properties and mechanical properties of the corn flour paste under the different corn flour particle size, water bath temperature, feed-to-liquid ratio and different glycerol content were studied. The relationship between rheological properties and mechanical properties of corn flour paste was discussed preliminarily. The results showed that the corn flour paste presented shear thinning pseudoplasticity, the viscosity affected the thixotropic behavior, and the corn flour film prepared with the highest thixotropy had the maximal tensile strength. The tensile strength of corn flour film was basically the same as that of corn starch film. The water vapor transmittance and solubility tests showed that the water vapor transmittance of corn flour film was slightly lower than that of corn starch film, but the solubility was not significantly different from that of corn starch film. The results of scanning electron microscopy showed that the surface of corn flour film and corn starch film were smooth, indicating that corn flour had preferable film-forming characteristics.