Application of pulsed electric fields with square wave pulse to milk inoculated with E. coli, P. fluorescens, and B. stearothermophilus

Jung Kue Shin, Kwan Jae Jung, Yu Ryang Pyun, Myong Soo Chung

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Ultra-high temperature (UHT) processed full fat milk inoculated with Escherichia coli, Pseudomonas fluorescens, and Bacillus stearothermophilus was exposed to 30-60 kV/cm square wave pulsed electric field (PEF) with 1 μsec pulse width, and 26-210 μsec treatment time in a continuous PEF treatment system. Eight log reduction was obtained for E. coli and P fluorescens and 3 logs reduced for B. stearothermophilus under PEF treatment conditions of 210 μsec treatment time, 60 kV/cm pulse intensity at 50°C. There was no significant change in pH and titration acidity of milk after PEF treatment. The electrical energy required to achieve 8 log reduction for E.coli and P fluorescens was estimated to be about 0.74 kJ/L.

Original languageEnglish
Pages (from-to)1082-1084
Number of pages3
JournalFood Science and Biotechnology
Volume16
Issue number6
StatePublished - 2007

Keywords

  • Electrical energy
  • Milk
  • Pulsed electric field

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