Effects of electroconductive heat treatment and electrical pretreatment on thermal death kinetics of selected microorganisms

Biotechnology and Bioengineering - Tập 39 Số 2 - Trang 225-232 - 1992
Sevugan Palaniappan1, Sudhir K. Sastry1, Edward R. Richter2
1Department of Agricultural Engineering, Ohio State University, Columbus, Ohio 43210
2Silliker Laboratories, Columbus, Ohio 43212

Tóm tắt

AbstractSuspensions 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 Ea) 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.

Từ khóa


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Thông tin xuất bản

Biotechnology and Bioengineering

Tập 39 Số 2

225-232

Thông tin tác giả