Antibiotic activity in aged Liederkranz cheese was found to be produced by the aerobic microorganisms inhabiting its surface. Brevibacterium linens was the principal source of the antimicrobial agent(s). Yeast of the Candida type and, when present, some other microorganisms contributed minor antimicrobial activity. The antimicrobial agent(s) of aged Liederkranz cheese had the following properties: 1) dialysable through cellulose casing, 2) absorbed on Norit A at acid pH, 3) stable in acid and alkaline …
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