Salt effect of nisin Z isolated from a marine fish on the growth inhibition of Streptococcus iniae, a pathogen of streptococcosis |
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Authors: | Won-Seok Heo Eun-Young Kim Yu-Ri Kim Muhammad Tofazzal Hossain In-Soo Kong |
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Institution: | (1) Department of Biotechnology, Pukyong National University, Busan, 608-737, Korea |
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Abstract: | A bacteriocin-producing Lactococcus lactis subsp. lactis was isolated from the intestine of olive flounder. The bacteriocin was identified as nisin Z. It was active against Gram-positive
bacteria. Nisin Z at 3,200 arbitrary units (AU) was more effective in seawater than in PBS; growth of Streptococcus iniae was completely inhibited within 3 h. Nisin Z preparations with 3.5% (w/v) NaCl was the most effective against S. iniae being similar to nisin Z in seawater. Nisin Z is thus a good alternative to antibiotics to prevent streptococcosis caused
by S. iniae aquaculture systems. |
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