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1993:
Arihara K; Cassens R G; Luchansky J B
Characterization of bacteriocins from Enterococcus faecium with activity against Listeria monocytogenes.
International journal of food microbiology 1993;
19(
2):.
Laboratory cultures and environmental isolates of bacteria were screened for antagonism towards Listeria monocytogenes using an agar spot test. Seven of the 163 strains that were tested, one Streptococcus bovis, one Enterococcus casseliflavus, two E. avium and three E. faecium, consistently displayed antilisterial activity. Cell-free, pH-neutralized supernatants prepared from the three E. faecium strains (JBL1061, JBL1083 and JBL1351) exhibited strong antilisterial activity against L. monocytogenes, and were subjected to more detailed analyses. The antagonistic factors produced by these three strains were sensitive to chloroform and several proteolytic enzymes, resistant to heat (121 degrees C, 20 min), and stable over a wide pH range (3.0-10.0). Moreover, they were listericidal without causing cell lysis. These data suggest that a bacteriocin(s) is involved in the inhibition of L. monocytogenes by E. faecium JBL1061, JBL1083 and JBL1351.
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