Document Detail

Inactivation of microorganisms in milk and apple cider treated with ultrasound.
MedLine Citation:
PMID:  16541685     Owner:  NLM     Status:  MEDLINE    
Nonthermal technologies are emerging as promising alternatives to heat treatment for food processing. Ultrasound, defined as sound waves with a frequency greater than 20 kHz, has proven bactericidal effects, especially when combined with other microbial-reduction strategies such as mild heating. In this study, ultrasound treatment (sonifier probe at 20 kHz, 100% power level, 150 W acoustic power, 118 W/cm2 acoustic intensity) with or without the effect of mild heat (57 degrees C) was effective at reducing microbial levels in raw milk, Listeria monocytogenes levels inoculated in ultrahigh-temperature milk, and Escherichia coli O157:H7 in apple cider. Continuous flow ultrasound treatment combined with mild heat (57 degrees C) for 18 min resulted in a 5-log reduction of L. monocytogenes in ultrahigh-temperature milk, a 5-log reduction in total aerobic bacteria in raw milk, and a 6-log reduction in E. coli O157:H7 in pasteurized apple cider. Inactivation regressions were second-order polynomials, showing an initial period of rapid inactivation, eventually tailing off. Results indicate that ultrasound technology is a promising processing alternative for the reduction of microorganisms in liquid foods.
Dennis J D'Amico; Todd M Silk; Junru Wu; Mingruo Guo
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of food protection     Volume:  69     ISSN:  0362-028X     ISO Abbreviation:  J. Food Prot.     Publication Date:  2006 Mar 
Date Detail:
Created Date:  2006-03-17     Completed Date:  2006-04-06     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  7703944     Medline TA:  J Food Prot     Country:  United States    
Other Details:
Languages:  eng     Pagination:  556-63     Citation Subset:  IM    
Department of Nutrition and Food Sciences, University of Vermont, Burlington, Vermont 05405, USA.
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MeSH Terms
Beverages / microbiology*
Colony Count, Microbial
Escherichia coli O157 / growth & development*
Food Handling / methods
Food Microbiology
Food Preservation / methods*
Hot Temperature
Listeria monocytogenes / growth & development*
Malus / microbiology
Milk / microbiology*,  ultrasonography
Time Factors
Ultrasonography / methods*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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