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Pulsed electric field treatment on Saccharomyces cerevisiae using different waveforms

Qin, S. and Timoshkin, I. V. and MacLean, M. and Wilson, M. P. and Given, M. J. and Wang, T. and Anderson, J. G. and MacGregor, S. J. (2015) Pulsed electric field treatment on Saccharomyces cerevisiae using different waveforms. IEEE Transactions on Dielectrics and Electrical Insulation, 22 (4). pp. 1841-1848. ISSN 1070-9878

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Pulsed electric field (PEF) treatment can be used for non-thermal inactivation of microorganisms. The aim of this paper is to investigate PEF treatment of yeast, Saccharomyces cerevisiae, using three different field waveforms: square; non-oscillating exponential and oscillating exponential. The PEF system used in this paper consists of a pulsed power supply and a parallel-plane metallic electrodes treatment cell located in an air-pressurised chamber. PEF treatment of the yeast was conducted using electric field impulses with magnitudes of 67 kV/cm and 80 kV/cm. The efficacy of the PEF treatment for inactivation of the yeast cells was assessed by comparison of the PEF-treated and untreated yeast populations. Results showed that 3-log10 reduction in the yeast population can be achieved with 100 impulses using all tested waveforms. Amongst all three tested waveforms non-oscillating exponential impulses demonstrated improved PEF performance. The effect of duration of treatment and peak magnitude of the field on the PEF process is discussed.