喷雾干燥法制备非晶颗粒态玉米淀粉

Preparation of Non-crystal Granular Starch by Spray Drying Method

预加热玉米原淀粉,以喷雾干燥的方式,研究制备非晶颗粒态玉米淀粉的新方法。考察了淀粉乳浓度,喷雾干燥工艺条件及预加热温度对玉米淀粉非晶化产品的影响。用偏光显微镜观测处理后的淀粉样品,结合X射线衍射曲线验证淀粉颗粒结构的变化,利用扫描电镜观测淀粉颗粒,并宏观的观察处理后样品的状态。结果表明:淀粉乳浓度150 g/L,喷雾干燥机进风温度230℃,蠕动泵转速50 r/min,预加热温度控制在70℃,制备出非晶化率达到95%以上非晶颗粒态玉米淀粉。

A new method for preparation of non-crystallized granule starch by pre-heating corn starch with spray drying was studied. The effects of starch concentration, technological parameters of spray drying, and pre-heat temperature on non-crystal granular corn starch was investigated. The structure and appearance were observed by micro- polariscopy and scanning electron microscopy. Combining the X- diffraction spectrum, the change from crystal to non- crystal was confirmed. The results indicated ： when starch concentration was 15% , the inlet temperature of the heated wind in spry-drying process was 230℃ , rotation speed of flexible tube pump was 50 r/min,and pre-heat temperature was 70℃. Under the above condition, 95% of original corn starch particles was converted into amorphous non-crystal granular state.