open access

https://hdl.handle.net/2115/71270

Ohmic Heating for Milk Pasteurization : Effect of Electric Current on Nonthermal Injury to Streptococcus thermophilus

英語

nonthermal injur

2006

American Society of Agricultural and Biological Engineers (ASABE)

ASABE meeting paper

No. 066025

Written for presentation at the 2006 ASABE Annual International Meeting Sponsored by ASABE

Abstract: Experiments on milk pasteurization were conducted with cells of Streptococcus thermophilus 21072 to confirm the lethal effect of electric current using combination treatment (sublethal ohmic and conventional heating treatment) and control treatment (conventional heating treatment only). Bacteria counts and calculated decimal reduction times (D value) of combination treatment indicated that combination treatment had significantly higher lethality than that of control treatment under the condition of the same temperature histories (p<0.05). However, no pasteurizing effect of the electric current on bacteria cells was observed during the sublethal ohmic treatment. The results suggested that sublethal ohmic treatment decreased the heat resistance of bacteria probably due to nonthermal injury of bacteria caused by the electric current.

学術雑誌論文

Version of Record

Technical presentations are not subject to the formal peer review process by ASABE editorial committees; therefore, they are not to be presented as refereed publications. Citation of this work should state that it is from an ASABE meeting paper. EXAMPLE: Author's Last Name, Initials. 2006. Title of Presentation. ASABE Paper No. 06xxxx. St. Joseph, Mich.: ASABE.