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KMID : 0545119920020020073
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Journal of Microbiology and Biotechnology
1992 Volume.2 No. 2 p.73 ~ p.77
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Competitive Growth and Attachment of Listeria monocytogenes and Lactococcus lactis ssp. lactic ATCC 11454
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LEE SHIN-HO
JOSEPH F. FRANK
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Abstract
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The effect of a nisin-produdng Lactococcus lactis spp. lactis (L. lactic) on the growth and attachment of Listeria monocytogenes Scott A and Brie 1 on stainless steel and their growth in Brain Heart Infusion broth was determined. Viable cells of Listeria decreased rapidly after 9∼12 hr of incubation at 21℃ and after 6∼9 hr of incubation at 32℃ in the presence of L. lactic. The number of L. monocytogenes Scott A attached to stainless steel in pure culture was 2.5×10 exp (3)/㎠ at 21℃ and 2.3×10 exp (3)/㎠ at 32℃ after 48 hr of incubation, but was only 10/㎠ at 21℃ and 1.1×10/㎠ at 32℃ in the presence of L. lactis. Results from L monocytogenes strain Brie 1 were similar to those from strain Scott A. The population of L. monocytogenes Scott A which attached to stainless steel with previously adherent L. lactis was 1.8×10 exp (2)/㎠ at 21℃ and 8.2×10 exp (2)/㎠ at 32℃, whereas the population attached to sterile stainless steel was 12×10 exp (3)/㎠ at 21℃ and 2.1×10 exp (2)/㎠ at 32℃. For L. monocytogenes Brie 1, the attached population of the control was 1.6×10 exp (4)/㎠ at 21℃ and 3.2×10 exp (2)/㎠ at 32℃, and on stainless steel with adherent L. lactis, it was 1.1×10 /㎠ at 21℃ and 6.9×10/㎠ at 32℃. Surface adherent L. lactis was less inhibitory to attachment of L. monocytogenes on stainless steel than a liquid culture inoculum. Listeria attached to stainless steel survived dry storage for 20 days both in the presence and absence of adherent lactococd.
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