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Properties and safety aspects of Enterococcus faecium strains isolated from Chungkukjang, a fermented soy product

Authors
Yoon, Mi YoungKim, Young JunHwang, Han-Joon
Issue Date
2008
Publisher
ELSEVIER
Keywords
Chungkukjang; Enterococcus foecium; fermented food; probiotic; starter culture
Citation
LWT-FOOD SCIENCE AND TECHNOLOGY, v.41, no.5, pp.925 - 933
Indexed
SCIE
SCOPUS
Journal Title
LWT-FOOD SCIENCE AND TECHNOLOGY
Volume
41
Number
5
Start Page
925
End Page
933
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/125577
DOI
10.1016/j.lwt.2007.05.024
ISSN
0023-6438
Abstract
Enterococcus faecium isolated from Chungkukjang, a Korean traditional fermented soybean food was studied for their functional characteristics as potential new starter culture and safety. Microbiological analysis of ripened Chungkukjang revealed the presence of an enterococcal Population in numbers or up to 6 log CFU per g. Seven isolates with higher activity were selected for further study and the strains were identified as E. faecium. The E faecium strains showed resistance against simulated gastrointestinal conditions such as acidic environment and the presence of bile salts. These strains also showed bile salt hydrolase activity but neither hemolytic activity nor virulence determinant such as gelE and efaAfm. All strains were susceptible to glycopeptides and lacked potential as vancomycin-resistant enterococci (VRE). Two strains, S2C10 and S2C11, showed inhibited the viability of Listeria monocytogenes in vitro. The ability was probably due to the production of bacteriocin. The lipase activity influenced the stability, while either acidic condition or high temperature did not play a significant role in the activity of the antimicrobial substances. The strains also produced thermostable listericidal antimicrobial substance. For this reason, the strains Could be used Lis selected starters or protective cultures in soybean fermented food production. (c) 2007 Published by Elsevier Ltd. on behalf of Swiss Society of Food Science and Technology.
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