小麦麸皮膳食纤维挤压加工工艺研究

Research on Extrusion Processing of Wheat Bran Dietary Fiber

以小麦麸皮膳食纤维为原料,采用双螺杆挤压机对其进行挤压加工,以提高小麦麸皮膳食纤维中可溶性膳食纤维的含量。研究了挤压温度、物料含水量和螺杆转速对原料中可溶性膳食纤维含量的影响,研究结果表明:麸皮含水量20%,挤压温度170℃,主机转速185 r/min时,麸皮原料中可溶性膳食纤维含量由3.22%提高到10.14%。通过高效液相色谱、扫描电镜检测及持水力与膨胀力试验显示,加压处理可以有效地增加可溶性膳食纤维的含量,以及改变麸皮的表面结构。

Wheat bran dietary fiber as raw material,twin-screw extruder extrusion process was employed to enhance the soluble dietary fiber content in wheat bran dietary fiber.The effect of extrusion temperature,moisture content of materials and screw speed on the content of soluble dietary fiber in the raw material were investigated.The results suggested that： wheat bran moisture content 20%,extrusion temperature 170 ℃ and the host speed 185 r/min,the bran soluble dietary fiber content of raw materials was increased from 3.22% to 10.14%.HPLC detection,scanning electron microscopy and water holding capacity and swelling force experiments showed that pressure treatment can effectively increase the soluble dietary fiber content,and change the surface structure of wheat bran.