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Microbial interactions associated with secondary cucumber fermentation.
MedLine Citation:
PMID:  23013318     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
AIMS: To evaluate the interaction between yeasts and bacteria and associate their metabolic activity with secondary cucumber fermentation. METHODS AND RESULTS: Selected yeast and bacteria, isolated from cucumber secondary fermentations, were inoculated as single and mixed cultures in a cucumber juice model system. Our results confirmed that during storage of fermented cucumbers and in the presence of oxygen, spoilage yeasts are able to grow and utilize the lactic and acetic acids present in the medium, which results in increased brine pH and the chemical reduction of the environment. These conditions favor opportunistic bacteria that continue the degradation of lactic acid. Lactobacillus buchneri, Clostridium bifermentans and Enterobacter cloacae were able to produce acetic, butyric, and propionic acids, respectively, when inoculated in the experimental medium at pH 4.6. Yeast and bacteria interactions favored the survival of Cl. bifermentans and E. cloacae at the acidic pH typical of fermented cucumbers (3.2), but only E. cloacae was able to produce a secondary product. CONCLUSIONS: The methodology used in this study confirmed that a complex microbiota is responsible for the changes observed during fermented cucumber secondary fermentation and that certain microbial interactions may be essential for the production of propionic and butyric acids. SIGNIFICANCE AND IMPACT OF STUDY: Understanding the dynamics of the development of secondary cucumber fermentation aids in the identification of strategies to prevent its occurrence and economic losses for the pickling industry. © No claim to US Government works. Journal of Applied Microbiology © 2012 The Society for Applied Microbiology.
Authors:
Wendy Franco; Ilenys M Pérez-Díaz
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-26
Journal Detail:
Title:  Journal of applied microbiology     Volume:  -     ISSN:  1365-2672     ISO Abbreviation:  J. Appl. Microbiol.     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9706280     Medline TA:  J Appl Microbiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© No claim to US Government works. Journal of Applied Microbiology © 2012 The Society for Applied Microbiology.
Affiliation:
Department of Food, Bioprocessing and Nutrition Sciences, North Carolina State University, 400 Dan Allen Drive, Raleigh, NC, 27698-7624.
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