Abstract
Out of some 800 strains of microorganisms, a potent fungus for milk clotting enzyme was isolated from soil during the course of screening tests and was identified as one of strains of Mucor pusillus Lindt. Satisfactory results were obtained in cheese making experiments with this enzyme which could be produced effectively by solid culture on wheat bran at 30°C for about 70 hrs.The balance between milk clotting activity and proteolytic activity of this enzyme resembled very much to that of rennet.Microbial rennet from Mucor pusillus F-27 was obtained with high productivity by solid culture followed by water extraction. The enzyme could be precipitated by salting out with ammonium sulfate and also by mixing with various water-miscible organic solvents such as ethanol, methanol or acetone.This enzyme is one of acid proteases having its optimal pH for milk casein digestion around 3.5. The ratio of milk clotting activity to proteolytic activity of this enzyme resembled that of calf rennet than those of other pr...
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