Document Detail

Efficacy of egg cleaning compounds on eggshells contaminated with Salmonella enterica serovar Enteritidis.
MedLine Citation:
PMID:  15083722     Owner:  NLM     Status:  MEDLINE    
Salmonella Enteritidis infections of egg contents can be related to external contamination of the shell. In this study, the efficacy of three commercial cleaning and/or sanitizing compounds (sodium carbonate, sodium hypochlorite, and potassium hydroxide) was evaluated for bactericidal activity at pH values of 10, 11, and 12 against various concentrations (10(2), 10(4), or 10(6) CFU/ml) of Salmonella Enteritidis inoculated onto the eggshell surface. Efficacy of these chemical agents was also assessed against Salmonella Enteritidis in aqueous suspension. Our results indicated that none of the chemicals applied at the recommended manufacturer's concentrations (sodium carbonate, 36 ppm; other treatments, 200 ppm) could eliminate Salmonella Enteritidis from eggshells artificially contaminated with the highest bacterial concentrations (10(4) or 10(6) CFU/ml). Higher concentrations of each product, at least 5 to 20 times greater than recommended doses, were needed to destroy the bacteria on egg surfaces. However, at or slightly above the manufacturer's recommended use concentrations, all three formulations were effective against Salmonella Enteritidis in aqueous suspension (10(8) CFU/ml) or on eggshells contaminated with 10(2) CFU/ml. For both shell and suspension assays, inactivation of Salmonella Enteritidis occurred at lower concentrations at pH 12 than at pH 11 and 10. Contact time between chemicals and Salmonella apparently influenced bacterial inactivation. Extended contact times (2 to 10 min) reduced minimum chemical concentrations necessary to inactivate the bacteria. However, neither pH nor contact time influenced Salmonella Enteritidis inactivation when the initial bacterial numbers on eggshells were high.
Gaudy Soljour; Mafu Akier Assanta; Serge Messier; Martine Boulianne
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of food protection     Volume:  67     ISSN:  0362-028X     ISO Abbreviation:  J. Food Prot.     Publication Date:  2004 Apr 
Date Detail:
Created Date:  2004-04-15     Completed Date:  2004-06-10     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:  706-12     Citation Subset:  IM    
Department of Pathology and Microbiology, Faculty of Veterinary Medicine, Montreal University, 3200 Rue Sicotte Saint-Hyacinthe, Quebec, Canada J2S 2M2.
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MeSH Terms
Carbonates / pharmacology
Colony Count, Microbial
Disinfectants / pharmacology*
Dose-Response Relationship, Drug
Egg Shell / microbiology*
Food Contamination / prevention & control
Food Microbiology
Hydrogen-Ion Concentration
Hydroxides / pharmacology
Potassium Compounds / pharmacology
Salmonella enteritidis / drug effects*,  growth & development
Sodium Hypochlorite / pharmacology
Time Factors
Reg. No./Substance:
0/Carbonates; 0/Disinfectants; 0/Hydroxides; 0/Potassium Compounds; 1310-58-3/potassium hydroxide; 497-19-8/sodium carbonate; 7681-52-9/Sodium Hypochlorite

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

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