Document Detail

Inactivation of food microorganisms by high-pressure carbon dioxide treatment with or without explosive decompression.
MedLine Citation:
PMID:  9255977     Owner:  NLM     Status:  MEDLINE    
In order to elucidate the sterilization mechanism underlying the explosive decompression system, baker's yeast was pressurized with CO2, N2O, N2, or Ar gas at 40 atm and 40 degrees C for 4h, and then explosively discharged. The survival ratio was markedly decreased only by the treatments with CO2 and N2O, which are relatively soluble gases in water, suggesting that the microorganisms' death may be highly correlated with gas absorption by the cells. Lower decompression rates to atmospheric pressure, however, led to neither any lower reduction of remaining cells nor any smaller release of total cellular proteins. Furthermore, operating with a longer treatment time and smaller number of repetitions was usually more lethal than with a shorter time and more frequent repetition. From these results, most of the yeast cells appear to have been sterilized during the pressurization process. The spore cells of B. megaterium are considered to have been killed in a somewhat different manner, because of their distinct sensitivity to the applied gases.
A Enomoto; K Nakamura; K Nagai; T Hashimoto; M Hakoda
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Bioscience, biotechnology, and biochemistry     Volume:  61     ISSN:  0916-8451     ISO Abbreviation:  Biosci. Biotechnol. Biochem.     Publication Date:  1997 Jul 
Date Detail:
Created Date:  1997-09-25     Completed Date:  1997-09-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9205717     Medline TA:  Biosci Biotechnol Biochem     Country:  JAPAN    
Other Details:
Languages:  eng     Pagination:  1133-7     Citation Subset:  B    
Department of Biological and Chemical Engineering, Faculty of Engineering, Gunma University, Japan.
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MeSH Terms
Argon / toxicity
Bacillus megaterium / drug effects
Carbon Dioxide / toxicity*
Decompression / methods
Food Microbiology*
Food Technology / methods*
Nitric Oxide / toxicity
Nitrogen / toxicity
Saccharomyces cerevisiae / drug effects
Spores, Bacterial / drug effects
Sterilization / methods*
Reg. No./Substance:
10102-43-9/Nitric Oxide; 124-38-9/Carbon Dioxide; 7440-37-1/Argon; 7727-37-9/Nitrogen

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

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