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Liquid Foods Treatments by PEF –A deep Analysis owing to Electromagnetic Theory
BibTeX
@MISC{Youmssi_liquidfoods,
author = {Andre Youmssi and Joseph Kayem and Frederic Sirois and Luc Takongmo Ngouadjo},
title = {Liquid Foods Treatments by PEF –A deep Analysis owing to Electromagnetic Theory},
year = {}
}
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Abstract
Abstract: It was observed that applying pulsed high voltages of the order 20kV or more with durations of 0 to 10 µs or less can destroy some micro organisms like Saccharomyces Cerevisiae which are commonly encountered in tropical liquid foods. The amplitude of the applied high pulsed signals, their durations, and the number of pulses per second seem experimentally necessary to obtain good results in terms of the number of destroyed micro organisms. Few studies have yet clearly explained quantitatively the mechanism of the observed destruction due to the application of very fast and intense electric fields on the undesired micro organisms in the foods. In this paper we attempt to contribute such explanations by using the theory of distributions applied in electromagnetism which seems more adequate for the analysis of fast phenomenon like the one that appears in the cells when they receive the pulsated electric field. We carefully consider in the study different real situations, where, we have the plates that carry the high voltage pulses, the media in which the micro organisms are immersed, as well as the micro organisms. Firstly we state some assumptions like the bipolarisation reactions of the micro organisms due to either natural polarization of some cell internal components, or to induced polarization of the cell that comes from the applied high voltages. We then analyse many cases using different variations of the parameters of, the electric source, the media, or the micro organisms. We begin the study with a case in which only one
Keyphrases
micro organism pef deep analysis electromagnetic theory liquid food treatment high voltage observed destruction high voltage pulse saccharomyces cerevisiae tropical liquid food many case different variation bipolarisation reaction good result fast phenomenon cell internal component destroyed micro organism pulsated electric field undesired micro organism natural polarization intense electric field electric source study different real situation
