Document Detail


Repair and enumeration of injured coliforms in frozen foods.
MedLine Citation:
PMID:  4588199     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Two strains of Escherichia coli manifested death and repairable injury after being frozen in water or sterile foods at -20 C. The injured survivors were inhibited from forming colonies on violet red bile agar (VRBA) or deoxycholate lactose agar; this inhibition was greater when enumeration was done by the pour plate method instead of the surface or surface-overlay method. Injured cells repaired rapidly in Trypticase soy broth (TSB), and the repair was about maximum after 1 h at 25 C. When the injured cells were added to different foods and incubated at 25 C, repair also occurred; however, recovery was better and more uniform when the samples were mixed with TSB and incubated 1 h at 25 C. Cell multiplication was not evident until after 90 to 120 min at 25 C. The enumeration of coliforms from commercially frozen foods was increased when the thawed samples were mixed with TSB and the cells were allowed to repair 1 h at 25 C. In some samples, the repair permitted at least a 20-fold increase in the coliform count. The associated flora in the commercially frozen foods gave no evidence of impairing the repair of coliforms, nor did they start multiplication prior to 90 min after being incubated in TSB at 25 C. Generally, the plating gave more reproducible recovery of coliforms than did the most probable number method. Also, a higher number of coliforms were obtained by the surface-overlay method of plating using VRBA.
Authors:
M Warseck; B Ray; M L Speck
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied microbiology     Volume:  26     ISSN:  0003-6919     ISO Abbreviation:  Appl Microbiol     Publication Date:  1973 Dec 
Date Detail:
Created Date:  1974-02-27     Completed Date:  1974-02-27     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7605802     Medline TA:  Appl Microbiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  919-24     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Bacteriological Techniques
Cell Count
Cell Survival
Culture Media
Escherichia coli / growth & development,  isolation & purification*
Food Microbiology*
Food Preservation*
Freezing
Water
Chemical
Reg. No./Substance:
0/Culture Media; 7732-18-5/Water
Comments/Corrections

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