玉米皮多糖挤出低聚化的研究

以玉米皮为原料，经超临界CO2 流体萃取，脱脂、脱杂及酶法脱除蛋白质及淀粉后获得玉米皮多糖，采用挤出技术对其进行降解处理，制取玉米皮低聚多糖，采用黏度法测定其聚合度和分子量。通过正交试验，确定最佳挤出条件为：挤出温度175℃，料水比1:1.4，玉米皮多糖粒度0.147mm，喂料速度10kg/h。按此工艺条件处理玉米皮多糖，其聚合度由894 降低至66，分子量由144828 降至10612。

Study on Oligomerization of Corn Bran Polysaccharide through Extrusion

Polysaccharides were prepared from corn bran by the steps of supercritical CO2 fluid extraction for removing fat, alkaline protease hydrolysis for removing protein and α-amylase hydrolysis for removing starch. Then the oligomerization of corn bran polysaccharides was conducted through extrusion. According to degree of polymerization (DP) and molecular weight (MW) measured with viscosimetry, the oligomerization conditions of corn bran polysaccharides were optimized through orthogonal test. The results showed that the optimal conditions are as follows : material to liquid ratio 1:1.4, extrusion temperature 175 ℃, particle size of material 0.147 mm and feed speed of material 10 kg/h. Under the above conditions, the DP of corn bran polysaccharides drops from 894 to 66, and its MW reduces from 144828 to 10612.