Document Detail

Survival and growth of Listeria monocytogenes and enterohemorrhagic Escherichia coli O157:H7 in minimally processed artichokes.
MedLine Citation:
PMID:  14672214     Owner:  NLM     Status:  MEDLINE    
The ability of Listeria monocytogenes and Escherichia coli O157:H7 inoculated by immersion (at 4.6 and 5.5 log CFU/ g, respectively) to survive on artichokes during various stages of preparation was determined. Peeling, cutting, and disinfecting operations (immersion in 50 ppm of a free chlorine solution at 4 degrees C for 5 min) reduced populations of L. monocytogenes and E. coli O157:H7 by only 1.6 and 0.8 log units, respectively. An organic acid rinse (0.02% citric acid and 0.2% ascorbic acid) was more effective than a tap water rinse in removing these pathogens. Given the possibility of both pathogens being present on artichokes at the packaging stage, their behavior during the storage of minimally processed artichokes was investigated. For this purpose, batches of artichokes inoculated with L. monocytogenes or E. coli O157:H7 (at 5.5 and 5.2 log CFU/g, respectively) were packaged in P-Plus film bags and stored at 4 degrees C for 16 days. During this period, the equilibrium atmosphere composition and natural background microflora (mesophiles, psychrotrophs, anaerobes, and fecal coliforms) were also analyzed. For the two studied pathogens, the inoculum did not have any effect on the final atmospheric composition (10% O2, 13% CO2) or on the survival of the natural background microflora of the artichokes. L. monocytogenes was able to survive during the entire storage period in the inoculated batches, while the E. coli O157:H7 level increased by 1.5 log units in the inoculated batch during the storage period. The modified atmosphere was unable to control the behavior of either pathogen.
Susana Sanz; Mercedes Giménez; Carmen Olarte
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of food protection     Volume:  66     ISSN:  0362-028X     ISO Abbreviation:  J. Food Prot.     Publication Date:  2003 Dec 
Date Detail:
Created Date:  2003-12-15     Completed Date:  2004-01-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7703944     Medline TA:  J Food Prot     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2203-9     Citation Subset:  IM    
Area de Tecnología de los Alimentos, Departamento Agricultura y Alimentación, Universidad de La Rioja, C/Madre de Dios, 51 26006-Logroño, Spain.
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MeSH Terms
Ascorbic Acid / pharmacology
Carbon Dioxide / analysis
Chlorine / pharmacology
Citric Acid / pharmacology
Colony Count, Microbial
Cynara scolymus / microbiology*
Disinfectants / pharmacology*
Escherichia coli O157 / drug effects,  growth & development*
Food Handling / methods*
Food Microbiology*
Food Packaging / methods
Hydrogen-Ion Concentration
Listeria monocytogenes / drug effects,  growth & development*
Oxygen / analysis
Time Factors
Reg. No./Substance:
0/Disinfectants; 124-38-9/Carbon Dioxide; 50-81-7/Ascorbic Acid; 77-92-9/Citric Acid; 7782-44-7/Oxygen; 7782-50-5/Chlorine

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