微波对蜡玉米淀粉糊流变特性的影响

Influence of Microwave Irradiation on the Rheological Property of Waxy Corn Starch Paste

摘要:

本文采用微波辐射对蜡玉米淀粉糊进行改性。利用旋转粘度计对微波改性前后蜡玉米淀粉糊的流变特性进行研究，探讨了不同的温度、微波功率和微波时间对蜡玉米淀粉糊流特性的影响规律。结果表明，微波作用对蜡玉米淀粉糊的流变特性有显著影响。蜡玉米淀粉糊为假塑性流体，经微波处理后，由于淀粉的质量浓度变小，粘度下降，致使蜡玉米淀粉糊的流动曲线趋向平直，有向牛顿型流体变化的趋势，且随着微波加热温度的升高、微波功率的增大和时间的延长，变化趋势越明显。

Abstract:

The modification of waxy corn starch paste by microwave irradiation was studied. The effects of temperature, microwave power and irradiation time on the rheological property of waxy corn starch paste were investigated using a rotary viscometer. Results showed that the rheological property could be greatly affected by microwave irradiation. The treatment of microwave irradiation decreased the concentration and viscosity of the paste, changing the paste from a pseudoplastic fluid to a Newtonian fluid. This change tendency became obvious by improving the temperature and the power as well as prolonging the irradiation time.