Abstract
In the course of screening tests of Basidiomycete proteolytic enzymes, it was observed that some strains produced milk clotting enzymes with fairly weak proteolytic activities.When sucrose-polypeptone and sucrose-corn steep liquor media were used, only 6 strains out of 44 strains tested showed weak milk clotting activities. Cheddar cheese making with culture filtrates of these 6 strains revealed that the culture filtrates of 2 strains, Irpex lacteus Fr. and Fomitopsis pinicola (Fr.) Karst., were able to produce Cheddar cheese of good quality.On the other hand, when sucrose-distillers solubles media were used, a lot of strains showed high proteolytic activity in addition to high milk clotting activity. The ratio of milk clotting to proteolytic activities (MCA/PA) was assumed to be an important index for the selection of organism, and F. pinicola and Coriolus consors (Berk.) Imaz. were selected as the strain with high MCA/PA ratio.As the investigation on culture conditions of 3 strains mentioned above showe...
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