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KMID : 1007520070160061082
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Food Science and Biotechnology
2007 Volume.16 No. 6 p.1082 ~ p.1084
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Application of Pulsed Electric Fields with Square Wave Pulse to Milk Inoculated with E. coli, P. fluorescens, and B. stearothermophilus
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Shin Jung-Kue
Jung Kwan-Jae
Pyun Yu-Ryang
Chung Myong-Soo
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Abstract
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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℃ 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. luorescens was estimated to be about 0.74 kJ/L.
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KEYWORD
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milk, pulsed electric field, electrical energy
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