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The susceptibility of Streptococcus thermophilus 14085 to organic acid, simulated gastric juice, bile salt and disinfectant as influenced by cold shock treatment.
MedLine Citation:
PMID:  23122501     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Streptococcus thermophilus is a thermophilic lactic acid bacterium which is used as the starter organism for the fermentation of yoghurt and some cheese. In the present study, S. thermophilus BCRC 14085 was subjected to cold shock treatment by exposure at 10 °C for 2 h. The effect of cold shock on the susceptibility of S. thermophilus in subsequent lethal stress environments such as simulated gastric juice (pH 2.0-3.0), bile solution (2.0%) and various organic acids (0.75 M, pH 3.5) including propionic, lactic, acetic, citric and tartaric acid was investigated. In addition, the survival of cold-shocked and non-shocked S. thermophilus exposed to disinfectants, Clidox-S and Quatricide, were compared. Results revealed that cold shock enhanced the tolerance of S. thermophilus in the presence of simulated gastric juice (pH 2.5 and 2.8), while in bile solution, the population increase of cold-shocked cells is higher than that of non-shocked cells after 12 h of incubation. Furthermore, the susceptibility of S. thermophilus, regardless of cold shock, to organic acid varied with the kinds of organic acid examined. The cold-shocked S. thermophilus showed a significantly less survival (P < 0.05) than that of the non-shocked cells when exposed to lactic or acetic acid. Furthermore, cold shock reduced the survival of S. thermophilus when exposed to Quatricide but not Clidox-S.
Authors:
Shiu-Hui Fang; Ying-Jang Lai; Cheng-Chun Chou
Publication Detail:
Type:  Journal Article     Date:  2012-09-10
Journal Detail:
Title:  Food microbiology     Volume:  33     ISSN:  1095-9998     ISO Abbreviation:  Food Microbiol.     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2012-11-05     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8601127     Medline TA:  Food Microbiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  55-60     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Affiliation:
Graduate Institute of Food Science and Technology, National Taiwan University, Taipei, Taiwan.
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