高流动性、强疏水性淀粉的制备及性能

Preparation of Hydrophobic Starch with High Flowability and Its Properties

采用干法改性处理技术对玉米淀粉进行改性处理,制备得到具有高流动性及强疏水性的玉米淀粉。通过活化指数、接触角、流动时间及休止角等指标,对改性前后玉米淀粉的流动性及疏水性进行评价。结果表明,经过改性处理,玉米淀粉由亲水性表面转变为强疏水性表面,并且改性后的玉米淀粉具有了良好的流动性。X射线衍射(XRD)测试结果表明,改性处理并没有改变玉米淀粉的结晶结构,只是改变玉米淀粉的表面性质。

A new dry process for the production of hydrophobic corn starch without the use of any organic solvent was developed, and the hydrophobic corn starch with high flowability was produced. The flowability and hydrophobicity of the virgin and modified corn starches were characterized by wettability experiments （the activation index and the contact angle）, flowability experiments （the flow time and the repose angle）. The results indicated that the surface of the corn starch could be changed from a hydrophilic one to a hydrophobic one by surface modification, and the modified corn starch with high flowability. The X-ray diffraction （XRD） results showed that the crystalline structures of the virgin and modified corn starches were not changed,and only the surface properties were changed.