Document Detail

Decontamination of Escherichia coli O157:H7 and Salmonella enterica on blueberries using ozone and pulsed UV-light.
MedLine Citation:
PMID:  18034733     Owner:  NLM     Status:  MEDLINE    
Efficacy of gaseous ozone, aqueous ozone, and pulsed UV-light was evaluated for the purpose of decontaminating blueberries artificially contaminated with either Escherichia coli O157:H7 or Salmonella. Blueberries were exposed to 4 different gaseous ozone treatments: continuous ozone exposure, pressurized ozone exposure, and 2 combined treatments. Maximum reductions of Salmonella and E. coli O157:H7 after 64-min pressurized or 64-min continuous exposure were 3.0 and 2.2 log(10) CFU/g, respectively. Aqueous ozone experiments were conducted at 20 degrees C and 4 degrees C and zero plate counts were observed for E. coli O157:H7 and Salmonella after 64 min of ozone exposure at 20 degrees C. Finally, pulsed UV-light was evaluated at 3 different distances from the light. Maximum reductions of 4.3 and 2.9 log(10) CFU/g were observed at 8 cm from the light after 60 s of treatment for Salmonella and E. coli O157:H7, respectively. A sensory analysis as well as color analysis was performed on blueberries from each treatment agent; neither analysis detected a difference between treated and untreated blueberries. The results presented in this study indicate that ozone and pulsed UV-light are good candidates for decontamination of blueberries.
K L Bialka; A Demirci
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of food science     Volume:  72     ISSN:  1750-3841     ISO Abbreviation:  J. Food Sci.     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2007-11-23     Completed Date:  2008-03-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0014052     Medline TA:  J Food Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  M391-6     Citation Subset:  IM    
Dept. of Agricultural and Biological Engineering, and The Huck Inst. of Life Sciences, The Pennsylvania State Univ., Univ. Park, PA 16802, USA.
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MeSH Terms
Analysis of Variance
Blueberry Plant / drug effects,  microbiology*,  radiation effects
Colony Count, Microbial
Consumer Satisfaction
Escherichia coli O157 / drug effects,  growth & development*,  radiation effects
Food Contamination / prevention & control*
Food Handling / methods
Food Irradiation / methods
Food Microbiology*
Oxidants, Photochemical / pharmacology
Ozone / pharmacology*
Salmonella enterica / drug effects,  growth & development*,  radiation effects
Sensation / drug effects,  physiology
Treatment Outcome
Ultraviolet Rays*
Reg. No./Substance:
0/Oxidants, Photochemical; 10028-15-6/Ozone

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

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