Abstract:To improve the dissolution of mushrooms soluble nitrogen compounds, the screw extrusion processing was adopted and the effects of cylinder temperature, screw speed, feed rate moisture content of materials and protease hydodrlysis were studied. Experimental results showed that , using NSI and amino nitrogen as the main indicators combined with other physical parameters,the optimal parameters for the screw extrusion were determined as screw speed 25 r/min, the moisture content of materials 10%, barrel temperature 160 ℃and feed rate 9 r/min. under the optimum conditons, NSI value was up to 73.93 %. Various factors on the NSI of the order as follows: screw speed > moisture content of materials > cylinder temperature > feed rate. Further trypsin enzyme enables the NSI and the amino nitrogen content were increased by 94.94% and 82.94%, respectively.
