Abstract:

Extruded soybean dregs were used as the raw material for extracting polysaccharide by hot water extraction, ultrasonicassisted extraction or microwave-assisted extraction. Optimal hot water extraction technology was investigated using single factor method, and optimal ultrasonic-assisted extraction and microwave-assisted extraction technologies using single factor method coupled to orthogonal array design for maximizing polysaccharide yield. Results showed that optimized hot water extraction, ultrasonic-assisted extraction and microwave-assisted extraction gave polysaccharide yields of 3.45%, 8.67% and 11.60%, respectively. In comparison with conventional hot water extraction, other two methods have the benefits of safety, saving energy, rapidity, high productivity, and so on.

Key words: extruded soybean dregs, ultrasonic, microwave, extraction, polysaccharide