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Isolation of Bacillus licheniformis Producing Antimicrobial Agents against Bacillus cereus and Its Properties  

Kim, Yong-Sang (Faculty of Biological Sciences and Institute for Molecular Biology and Genetics, Chonbuk National University)
Yun, Suk-Hyun (Faculty of Biological Sciences and Institute for Molecular Biology and Genetics, Chonbuk National University)
Jeong, Do-Yeon (Institute of Sunchang Fermented Soybean Products)
Hahn, Kum-Su (Institute of Sunchang Fermented Soybean Products)
Uhm, Tai-Boong (Faculty of Biological Sciences and Institute for Molecular Biology and Genetics, Chonbuk National University)
Publication Information
Korean Journal of Microbiology / v.46, no.3, 2010 , pp. 270-277 More about this Journal
Abstract
In order to manufacture Bacillus cereus-free fermented soybean products, an antimicrobial agentproducing isolate against B. cereus was obtained from 150 traditionally fermented soybean products. The morphological and biochemical tests and the phylogenetic relationship among 16S rRNA gene sequences indicated that the isolate named as the strain SCK 121057 was most closely related to Bacillus licheniformis. The B. licheniformis isolate began to produce the antimicrobial agent after 48 h of incubation. The agent was nonproteinaceous and insensitive to heat, long term storage and protease K. Electron microscopic observation indicated that the agent attacked the membrane of B. cereus, leaving the ghost cell. The isolate inhibited growth of B. subtilis, Lactobacillus brevis and various types of pathogenic strains including Escherichia coli, E. faecalis, Micrococcus luteus, Staphylococcus aureus, Aspergillus flavus, A. ochraceus, and A. parasiticus as well as B. cereus. After coinoculation of B. licheniformis SCK 121057 and B. cereus in the ratio (as the basis of CFU/g sample) of 10 to 1 on the surface of cooked soybeans, cell numbers of B. cereus had been dramatically reduced after 31 days of incubation compared to those of single inoculation of B. cereus.
Keywords
antibacterial agent; antifungal agent; B. cereus; B. licheniformis;
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