Document Detail


Synergistic effects of high hydrostatic pressure, mild heating, and amino acids on germination and inactivation of Clostridium sporogenes spores.
MedLine Citation:
PMID:  22983975     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The synergistic effects of high hydrostatic pressure (HHP), mild heating, and amino acids on the germination of Clostridium sporogenes spores were examined by determining the number of surviving spores that returned to vegetative growth after pasteurization following these treatments. Pressurization at 200 MPa at a temperature higher than 40°C and treatment with some of the 19 l-amino acids at 10 mM or higher synergistically facilitated germination. When one of these factors was omitted, the level of germination was insignificant. Pressures of 100 and 400 MPa were less effective than 200 MPa. The spores were effectively inactivated by between 1.8 and 4.8 logs by pasteurization at 80°C after pressurization at 200 MPa at 45°C for 120 min with one of the amino acids with moderate hydrophobicity, such as Leu, Phe, Cys Met, Ala, Gly, or Ser. However, other amino acids showed poor inactivation effects of less than 0.9 logs. Spores in solutions containing 80 mM of either Leu, Phe, Cys, Met, Ala, Gly, or Ser were successfully inactivated by pasteurization by more than 5.4 logs after pressurization at 200 MPa at 70°C for 15 to 120 min. Ala and Met reduced the spore viability by 2.8 and 1.8 logs, respectively, by pasteurization at a concentration of 1 mM under 200 MPa at 70°C. These results indicate that germination of the spores is facilitated by a combination of high hydrostatic pressure, mild heating, and amino acids.
Authors:
Takateru Ishimori; Katsutoshi Takahashi; Masato Goto; Suguru Nakagawa; Yoshiaki Kasai; Yukifumi Konagaya; Hiroshi Batori; Atsushi Kobayashi; Hiroshi Urakami
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-09-14
Journal Detail:
Title:  Applied and environmental microbiology     Volume:  78     ISSN:  1098-5336     ISO Abbreviation:  Appl. Environ. Microbiol.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-11-09     Completed Date:  2013-04-15     Revised Date:  2013-07-11    
Medline Journal Info:
Nlm Unique ID:  7605801     Medline TA:  Appl Environ Microbiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  8202-7     Citation Subset:  IM    
Affiliation:
Department of Food Sciences, Niigata University of Pharmacy and Applied Life Sciences, Higashijima, Akiha-ku, Niigata, Japan.
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MeSH Terms
Descriptor/Qualifier:
Amino Acids / metabolism
Clostridium / drug effects*,  growth & development,  physiology,  radiation effects*
Heating
Hydrostatic Pressure
Microbial Viability / drug effects*,  radiation effects*
Pasteurization / methods*
Spores, Bacterial / drug effects*,  growth & development,  physiology,  radiation effects*
Chemical
Reg. No./Substance:
0/Amino Acids
Comments/Corrections

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


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