Abstract
The effects of stimulation of Saccharomyces cerevisiae cells in an aqueous suspension by pulsed electric field (PEF) with electric field strength E = 20–2,000 V cm−1 and effective PEF treatment time t PEF = 10−5–1 s were investigated. At relatively high electric field strengths (E > 1,000 V cm−1) and moderate times of PEF treatment (t PEF > 100 μs), the extraction of ionic components from yeast was observed, which can be related to electroporation of cell membranes. Petri dishes counting revealed dependency of the colony sizes on the time of preliminary fermentation t f and power consumption W. The “logarithmic” and “saturated” types of electrostimulation were distinguished. At “logarithmic” electrostimulation (10−7 J mL−1 < W < 10−1 J mL−1), the viability of yeast cells increased with the increase of power consumption and was higher for longer fermentation (t f = 24 h). However, at “saturated” electrostimulation (10−1 J mL−1 < W < 101 J mL−1), the viability of yeast cells was noticeably higher for t f = 1 h than for t f = 24 h. The impact of preliminary fermentation time and PEF protocol on biological activity of cells and consumption of nutrients was also discussed.
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Acknowledgments
The authors appreciate the financial support from the financial support from the CNRS-Lebanon and the support from the COST Action TD1104 (EP4Bio2Med-European Network for Development of Electroporation-based Technologies and treatments). The authors also thank Dr. N.S. Pivovarova for her help with the preparation of the manuscript.
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Mattar, J.R., Turk, M.F., Nonus, M. et al. Stimulation of Saccharomyces cerevisiae Cultures by Pulsed Electric Fields. Food Bioprocess Technol 7, 3328–3335 (2014). https://doi.org/10.1007/s11947-014-1336-4
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DOI: https://doi.org/10.1007/s11947-014-1336-4