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 usec pulse width, and 26-210 usec 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 usec 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. fluorescens was estimated to be about 0.74 kJ/L.
목차
Abstract Introduction Materials and Methods Results and Discussion References
키워드
milkpulsed electric fieldelectrical energy
저자
Shin, Jung-Kue [ Department of Korean Traditional Food Culture, Jeonju University ]
Jung, Kwan-Jae [ Department of Biotechnology, Yonsei University ]
Pyun, Yu-Ryang [ Department of Biotechnology, Yonsei University ]
Chun, Myong-Soo [ Department of Food Science and Technology, Ewha Womans University ]
Corresponding author