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KMID : 1007520010100020199
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Food Science and Biotechnology
2001 Volume.10 No. 2 p.199 ~ p.203
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Control of Listeria monocytogenes in Ground Beef by Lactococcal Bacteriocins
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Paik, Hyun Dong
Lee, Na Kyoung/Ha, Jung Uk/Park, Hye Jung/Choi, Jin Ok
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Abstract
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The antagonistic effects of two lactococcal bacteriocins, lacticin NK24 and nisin, on the growth and survival of Listeria monocytogenes in refrigerated and frozen non-sterile ground beef were investigated. Ground beef was inoculated with approximately 3 log colonyforming units (CFU) of L. monocytogenes ATCC 15313 culture per gram of ground beef. Inoculated samples were blended with/without 100 AU/mL lacticin NK24 and nisin, and subsequently refrigerated or frozen. Listeria in the bacteriocin-treated and control samples were subsequently isolated from both refrigerated and frozen beef and enumerated as CFU on Listeria Isolation Agar medium. Microbial counts of ground beef treated with bacteriocin declined steadily, while those of nontreated samples increased steadily. The results demonstrated that nisin inhibited the growth of L. monocytogenes more effectively than lacticin NK24 at 100 AU/mL. Use of lactococcal bacteriocins, such as lacticin NK24 and nisin, under refrigerated and frozen storages is a promising approach for eliminating or reducing the risk of L. monocytogenes contamination in ground beef.
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KEYWORD
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