Document Detail


Thermal resistance of Bacillus stearothermophilus spores in different heating systems containing some approved food additives.
MedLine Citation:
PMID:  8862025     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effects of different heating systems on the heat resistance of Bacillus stearothermophilus spores (ATCC 7953, 12980, 15951 and 15952) were investigated. Spores were heated in distilled water, Sorensen buffer (0.18 mol 1-1), McIlvaine buffer (0.0025-0.18 mol 1-1), and several solutions containing sodium chloride (0.06-12%), sodium nitrite (125 ppm), potassium sorbate (0.1%) and sodium benzoate (0.1%) over a wide range of temperatures (115-140 degrees C). D-values obtained for McIlvaine and Sorensen buffers, at the same molarities, were not significantly different (P > 0.05), but decimal reduction times increased as phosphate concentrations in the solutions decreased. The concentrations, in which statistically significant differences (P < 0.05) were obtained, varied among strains. Among the additives assayed, only sodium chloride reduced heat resistance, being effective at concentrations as low as 0.06%. The z-values calculated in this study ranged from 6.99 to 8.40 with a mean value of 7.60 +/- 0.45. Although z-values observed for salt and buffers (180 mol 1-1) were slightly higher than obtained in the other conditions assayed, the difference was not statistically significant (P > 0.05).
Authors:
M López; M Mazas; I González; J González; A Bernardo
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Letters in applied microbiology     Volume:  23     ISSN:  0266-8254     ISO Abbreviation:  Lett. Appl. Microbiol.     Publication Date:  1996 Sep 
Date Detail:
Created Date:  1996-12-09     Completed Date:  1996-12-09     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  8510094     Medline TA:  Lett Appl Microbiol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  187-91     Citation Subset:  B    
Affiliation:
Area de Tecnología de los Alimentos, Facultad de Ciencias de Orense, Universidad de Vigo, Spain.
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MeSH Terms
Descriptor/Qualifier:
Benzoates / pharmacology
Benzoic Acid
Buffers
Food Additives / pharmacology
Geobacillus stearothermophilus / physiology*
Heating*
Sodium Chloride / pharmacology
Sodium Nitrite / pharmacology
Sorbic Acid / pharmacology
Spores, Bacterial / physiology
Chemical
Reg. No./Substance:
0/Benzoates; 0/Buffers; 0/Food Additives; 110-44-1/Sorbic Acid; 65-85-0/Benzoic Acid; 7632-00-0/Sodium Nitrite; 7647-14-5/Sodium Chloride

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


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