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Microbiology and Biotechnology Letters

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Bioactive Compounds / Food Microbiology  |  Probiotics and Foodborne Microorganisms

Microbiol. Biotechnol. Lett. 2018; 46(4): 313-319

https://doi.org/10.4014/mbl.1804.04016

Received: April 26, 2018; Accepted: July 16, 2018

Properties of Tetragenococcus halophilus Strains Isolated from Myeolchi (anchovy)-jeotgal

Jeong A Kim 1, Zhuang Yao 1, Venkatesh Perumal 2, Hyun-Jin Kim 1, 2 and Jeong Hwan Kim 1, 2*

1Division of Applied Life Science (BK21 plus), Graduate School, 2Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Korea

Halophilic lactic acid bacteria (LAB) were isolated from myeolchi-jeotgal (23% NaCl, w/v) fermented in jangdok (Korean earthenware) located outside a house. They were identified as Tetragenococcus halophilus by 16S rRNA and recA gene sequencing. Four T. halophilus isolates showing high protease activities were selected for further studies. Four strains grew well, reaching OD600 values of 0.75−0.92 at 18% NaCl content (w/v) and 0.28−0.44 at 23% salt. They showed rapid growth, attaining OD600 values of 1.1−1.2 at 20−30℃, but did not grow at 4℃. At 15℃, the highest OD600 values, which exceeded 0.6, were observed at 20 days, and were higher than those of cultures at 37℃ and 42℃ (approximately 0.5). Four isolates grew best in broth where the initial pH was adjusted to 8 and did not grow at pH ≤ 4. T. halophilus BS2-36 showed the highest survival ratio of 18.7% after 2 hours of exposure at pH 3. BS2-36 showed the highest survival ratio (1.29%) in presence of 0.3% bile salts. T. halophilus BS2-36 seems a promising candidate as a starter for jeotgal and other fermented foods with high salinities.

Keywords: Tetragenococcus halophilus, jeotgal, starter, fermented foods

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