Bacteriocin (monocin) interactions among Listeria monocytogenes strains

Monocin interactions of 97 strains of Listeria monocytogenes were assessed using an improved production method and standardisation of the monocins against the type strain of L. ivanovii. Monocins were resistant to trypsin, sensitive to heating at 56 degrees C for 30 min and stable at 4 degrees C. Only serovar 4 strains acted as indicators. A typing system using 8 producer and 11 indicator strains showed poor discrimination.