In this experiment, Aspergillus niger and Candida tropicalis were used as the fermentation strains for mixed fermentation, bran was used as the main fermentation substrate, and the protein content of bran was increased and the crude fiber content of bran was reduced as the measurement index to explore the best process parameters of solid-state fermentation. The results were as follows: the moisture content of bran was 70%, the ratio of strains was Aspergillus niger: Candida tropicalis = 2:1, the fermentation temperature was 32 ℃, and the fermentation time was 72 hours. The optimum combination of Aspergillus niger and Candida tropicalis was: the moisture content of bran was 60%, the ratio of strains was Aspergillus niger: Candida tropicalis = 1:1, the fermentation temperature was 29 ℃ The fermentation time was 60 hours, and the content of crude fiber was the highest.<br>
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