Orthogonal-array-design Optimization of Extraction Technologies of Polysaccharide from Soybeans

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.