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KMID : 0364820130490030286
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Korean Journal of Microbiology
2013 Volume.49 No. 3 p.286 ~ p.291
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Isolation and Identification of Bacillus Strains with Antagonistic Properties against Film-forming Yeasts Overgrown in Low Salted Soybean Pastes
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Jeon Sae-Bom
Ryu Myeong-Seon
Kim Yong-Sang
Cho Seung-Wha
Jeong Do-Yeon
Uhm Tai-Boong
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Abstract
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Soybean pastes with 8% (w/w) salinity were prepared instead of soybean paste with 14% (w/w) salinity to meet the
growing demands of Korean’s low sodium diet. After aging, white films had appeared on the surface of all
low-salted soybean pastes [8% (w/w) salinity] unlike high-salted soybean pastes [14% (w/w) salinity]. All of eight
microbes isolated from the surface film were identified as Pichia kudriavzevii. Eleven Bacillus strains with good
characteristics of fermentation were isolated from traditionally fermented soybean pastes in order to preserve their
unique flavors and aromas after aging, and as a result of analyzing the biochemical characteristics and 16S rRNA
sequences, those were identified as B. subtilis, B. licheniformis, and B. methylotrophicus. All of the Bacillus isolates
had antagonistic activities against 8 isolates of the film-forming yeasts and harbored the genes for synthesis of
antimicrobial surfactants including lichenysin and/ or surfactin.
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KEYWORD
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Bacillus, Pichia, antagonistic property, film-forming yeasts, low-salted soybean paste
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