Document Detail

Combined effects of ultrasound and surfactants to reduce Bacillus cereus spores on lettuce and carrots.
MedLine Citation:
PMID:  23290247     Owner:  NLM     Status:  In-Data-Review    
This study was performed to compare the effectiveness of ultrasound treatment singly and in combination with surfactants as an alternative method to conventional sanitizers containing chlorine for reducing numbers of Bacillus cereus spores on fresh produce. A cocktail of three strains of B. cereus (10876, ATCC 13061, and W-1) spores was inoculated onto iceberg lettuce and then treated with ultrasound for 0, 5, 10, 20 and 60min. Five minutes was found to be an adequate ultrasound (40kHz, 30W/L) treatment time which also caused no damage to lettuce leaf surfaces as observed through a field-emission scanning electron microscope (FE-SEM). Iceberg lettuce and carrots were inoculated with a cocktail of three strains of B. cereus spores and treated with combinations of ultrasound and various concentrations (0.03 to 0.3%) of surfactant (Tween 20, 40, 60, 80 and Span 20, 80, 85) solutions for 5min. The efficacy of the combination of ultrasound and surfactant increased depending on the hydrophile-lipophile balance (HLB). The most effective treatment for reducing levels of B. cereus spores was the combination of ultrasound and 0.1% Tween 20, yielding reductions of 2.49 and 2.22 log CFU/g on lettuce and carrots, respectively, without causing deterioration of quality. These reductions were 1 log greater than those obtained by immersion in 200ppm chlorine for 5min. Further research for elimination of B. cereus spores involving study of spore adhesion and removal mechanisms from food surfaces is needed, as well as devising an industrial-scale ultrasound system for the food industry.
Hun-Gu Sagong; Ho-Lyeong Cheon; Sang-Oh Kim; Sun-Young Lee; Ki-Hwan Park; Myung-Sub Chung; Young-Jin Choi; Dong-Hyun Kang
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Publication Detail:
Type:  Journal Article     Date:  2012-11-05
Journal Detail:
Title:  International journal of food microbiology     Volume:  160     ISSN:  1879-3460     ISO Abbreviation:  Int. J. Food Microbiol.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-01-07     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8412849     Medline TA:  Int J Food Microbiol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  367-72     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Elsevier B.V. All rights reserved.
Department of Agricultural Biotechnology and Center for Agricultural Biomaterials, Seoul National University, San 56-1, Sillim-dong, Gwanak-gu, Seoul 151-742, South Korea.
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