4. Conclusion
In the present paper, the content of SDF (12.65%) prepared from extruded soybean residue was significantly higher than the content of SDF (2.05%) prepared from soybean residue. It indicated that the twin-screw extrusion technology can significantly improve the content of SDF in soybean residue. At the same time, the extrusion efficiency of this process was higher than the single-screw extruder, because of the screw speed was increased, so it reduced the extrusion time greatly; in addition, the extrusion temperature of 110 °C was lower than the single-srew extruder, which was required lower energy and it was also benefited to industrialise.