Production and purification of a protease, a chitosanase, and chitin oligosaccharides by Bacillus cereus TKU022 fermentation

► This research aimed for the microbial reclamation of shrimp processing wastes. ► Production and purification of the protease and chitosanase from Bacillus cereus TKU022. ► The N-acetyl chitooligosaccharides can also be produced directly by strain TKU022 fermentation. ► The fermentation method for producing chitin oligomers can replace the method of enzymatic hydrolysis. ► This method can reduce the production cost of N-acetyl chitooligosaccharides.