Document Detail


Effects of electroconductive heat treatment and electrical pretreatment on thermal death kinetics of selected microorganisms.
MedLine Citation:
PMID:  18600935     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Suspensions of yeast cell (zygo Saccharomyces bailii) in a phosphate buffer solution were subjected to conventional (hot water) and ohmic (electric current) heating under identical temperature histories. Experiments were also conducted with cells of Escherichia coli to compare the lethal effect of combination of sublethal electrical preteatment and conventional heating with conventional heating. The kinetic parameters (D,Z,K and E(a)) were determined for both organisms during different treatments. There was no significant difference in the death rate of yeast cells during conventional and ohmic heating at the voltage range used in this study. Results of electrical pretreatment and conventional heating on E. coli indicated differences under certain conditions when compared with pure conventional heating. Thus it is concluded that microbial death during ohmic heating was due primarily to thermal effects with no significant effect of electric current per se. Sublethal electrical pretreatment appears to offer potential for increased bacterial inactivation in certain cases.
Authors:
S Palaniappan; S K Sastry; E R Richter
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Biotechnology and bioengineering     Volume:  39     ISSN:  0006-3592     ISO Abbreviation:  Biotechnol. Bioeng.     Publication Date:  1992 Jan 
Date Detail:
Created Date:  2008-07-08     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7502021     Medline TA:  Biotechnol Bioeng     Country:  United States    
Other Details:
Languages:  eng     Pagination:  225-32     Citation Subset:  -    
Affiliation:
Department of Agricultural Engineering, Ohio State University, Columbus, Ohio 43210.
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