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Soya bean tempe extracts show antibacterial activity against Bacillus cereus cells and spores.
MedLine Citation:
PMID:  20002864     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
AIMS: Tempe, a Rhizopus ssp.-fermented soya bean food product, was investigated for bacteriostatic and/or bactericidal effects against cells and spores of the food-borne pathogen Bacillus cereus.
METHODS AND RESULTS: Tempe extract showed a high antibacterial activity against B. cereus ATCC 14579 based on optical density and viable count measurements. This growth inhibition was manifested by a 4 log CFU ml(-1) reduction, within the first 15 min of exposure. Tempe extracts also rapidly inactivated B. cereus spores upon germination. Viability and membrane permeability assessments using fluorescence probes showed rapid inactivation and permeabilization of the cytoplasmic membrane confirming the bactericidal mode of action. Cooked beans and Rhizopus grown on different media did not show antibacterial activity, indicating the unique association of the antibacterial activity with tempe. Subsequent characterization of the antibacterial activity revealed that heat treatment and protease addition nullified the bactericidal effect, indicating the proteinaceous nature of the bioactive compound.
CONCLUSIONS: During fermentation of soya beans with Rhizopus, compounds are released with extensive antibacterial activity against B. cereus cells and spores.
SIGNIFICANCE AND IMPACT OF STUDY: The results show the potential of producing natural antibacterial compounds that could be used as ingredients in food preservation and pathogen control.
Authors:
P J Roubos-van den Hil; E Dalmas; M J R Nout; T Abee
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-11-28
Journal Detail:
Title:  Journal of applied microbiology     Volume:  109     ISSN:  1365-2672     ISO Abbreviation:  J. Appl. Microbiol.     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-10-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9706280     Medline TA:  J Appl Microbiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  137-45     Citation Subset:  IM    
Copyright Information:
© 2009 The Authors. Journal compilation © 2009 The Society for Applied Microbiology.
Affiliation:
Laboratory of Food Microbiology, Wageningen University, Wageningen, the Netherlands. Petra.Roubos@wur.nl
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