Study on Conditions of Producing Protease by Solid State Fermentation of Soybean with Aspergillus Oryzae

In the paper,taking activity of protease as a index conditions of producing protease by solid state fermentation of soybean with aspergillus oryzae by single-factor test(temperature,content of soy bean,formentation time)and orthogonal test(lq33)were studied.The results showed that the opimun conditions were:fermentation temperature 30 ℃,fermentation time 66 h,content of soybean 93%,under these conditions,the activity of protease was 572.85 U/g.