挤压加工对豆渣中可溶性膳食纤维和豆渣物性的影响

以豆渣粉为原料,通过优化挤压加工条件,提高豆渣中可溶性膳食纤维(SDF)的含量并改善豆渣物性.通过单因素实验,豆渣挤压的最佳工艺条件为:温度160,℃,物料水分25%,转速100,r/min.优化挤压条件后,豆渣中可溶性膳食纤维含量与原始豆渣相比从2.6%增加至30.1%.豆渣粉挤压前后的物性实验表明:挤压豆渣在水溶性、膨胀性和乳化性方面与原始豆渣粉相比分别提高10.4%、15.6%和130%.豆渣粉的差示扫描量热(DSC)分析结果表明:挤压豆渣粉在200,℃以下结构稳定;扫描电子显微镜(SEM)观察挤压豆渣结构,可以看出其纤维结构有明显的热降解现象.

Effect of Extrusion Processing on Soluble Dietary Fiber and Physical Properties of Soybean Residue

Soybean residue used as materials,the soluble dietary fiber(SDF)content of soybean residue was raised and physical properties was improved by optimizing the extrusion processing conditions.The results of single factor experiment suggested that,as the temperature was 160,℃,water content of raw materials was 25%,revolution speed of extruder was 100,r/min,the soluble dietary fiber content of soybean residue raised from 2.6% to 30.1% after extrusion.The physical property experiments showed that the water-solubility,expansion and emulsifying of extruded soybean residue raised 10.4%,15.6% and 130%,respectively.Extruded soybean residue remained structural stability below 200 ℃ through the analysis of differential scanning calorimetry(DSC).The fiber structure of extruded soybean residue appeared thermal degradation observed using the scanning electron microscopy(SEM).