Document Detail


Growth of Salmonella typhimurium in skim milk concentrates.
MedLine Citation:
PMID:  4551045     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The influence of various levels of skim milk solids and temperature on the duration of lag phase, growth rate, and extent of growth of Salmonella typhimurium was investigated. The effect on growth of salmonellae (and a strain of Escherichia coli) of reduced pressure at a constant solids level and under conditions simulating vacuum condensation of skim milk was also studied. S. typhimurium grew when inoculated into skim milk solutions ranging from 10 to 60% solids and over a temperature range of 23 to 44 C. At 10 to 12 C, growth was evident only in the 10% skim milk. As the total solids level was increased or incubation temperature was deviated from the optimum, or both, there was an increase in the lag phase and generation time of salmonellae. A lower cell population also resulted. The generation time at 37 C of S. typhimurium incubated at atmospheric pressure was approximately one-half that in skim milk concentrates held under reduced pressure. In addition, a slightly longer lag phase and lower cell yield characterized the growth under reduced pressure. Concentration of skim milk had little or no effect on viability of salmonellae or E. coli when the vapor temperature in the vacuum pan was below the maximum growth temperature for salmonellae. Increasing the vapor temperature to 48 C caused a two-log reduction in viable organisms during the concentrating period (65 min).
Authors:
C A Dega; J M Goepfert; C H Amundson
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied microbiology     Volume:  23     ISSN:  0003-6919     ISO Abbreviation:  Appl Microbiol     Publication Date:  1972 Jan 
Date Detail:
Created Date:  1972-04-25     Completed Date:  1972-04-25     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7605802     Medline TA:  Appl Microbiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  82-7     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Atmospheric Pressure
Bacteriological Techniques
Escherichia coli / growth & development
Food Microbiology*
Food Preservation
Manometry
Milk*
Partial Pressure
Salmonella typhimurium / growth & development*
Temperature
Thermometers
Comments/Corrections

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


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