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http://dx.doi.org/10.4014/jmb.1901.01016

Physicochemical Properties and Bacterial Communities of Meongge (Halocynthia roretzi) Jeotgal Prepared with 3 Different Types of Salts  

Kim, Jeong A (Division of Applied Life Science (BK21 Plus), Graduate School, Gyeongsang National University)
Yao, Zhuang (Division of Applied Life Science (BK21 Plus), Graduate School, Gyeongsang National University)
Kim, Hyun-Jin (Division of Applied Life Science (BK21 Plus), Graduate School, Gyeongsang National University)
Kim, Jeong Hwan (Division of Applied Life Science (BK21 Plus), Graduate School, Gyeongsang National University)
Publication Information
Journal of Microbiology and Biotechnology / v.29, no.4, 2019 , pp. 527-537 More about this Journal
Abstract
Three types of meongge (Halocynthia roretzi) jeotgal (MJ) were prepared with 3 different types of salts (12%, w/v): purified salt (PS), solar salt aged for 3 years (SS), and bamboo salt that had been recrystalized 3 times (BS). One set of MJ was fermented with starters, Bacillus subtilis JS2 and Tetragenococcus halophilus BS1-37 (each 6 log CFU/g), and another set without starters for 42 days at $10^{\circ}C$. The LAB count of the SSMJ (non-starter) was highest at day 28 (2.30 log CFU/g). The pH of the PSMJ and SSMJ was 5.72-5.77 at day 0, and 5.40-5.50 at day 42. BSMJ showed higher pH and lower titratable acidities than other samples. Amino-type nitrogen (ANN) increased continuously, and SSMJ showed higher values than other samples from day 14. Bacterial species of non-starter MJ were examined by culture independent method. Clone libraries of 16S rRNA genes were constructed in Escherichia coli from total DNA from non-starter MJ samples at day 0, 14, and 28. Thirty clones per each sample were randomly selected and DNA sequences were analyzed. Variovorax sp., uncultured bacterium, and Acidovorax sp. were the most dominant group at day 0, 14, and 28, respectively. Lactobacillus sakei and Streptococcus sp. were the next dominant group in SSMJ at day 28. A Streptococcus sp. was detected from PSMJ at day 28. Sensory evaluation for MJ samples at day 28 showed that SSMJ got higher overall acceptability scores. These results showed that solar salt can cause desirable changes in the microbial community of fermented foods, thereby positively affecting their overall quality.
Keywords
Meongge jeotgal; bacterial community; solar salt; LAB;
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