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http://dx.doi.org/10.9721/KJFST.2015.47.1.87

Intra- and Extra-cellular Mechanisms of Saccharomyces cerevisiae Inactivation by High Voltage Pulsed Electric Fields Treatment  

Lee, Sang-Jae (Department of Bio-Food Materials, Silla University)
Shin, Jung-Kue (Department of Korean Cuisine, Jeonju University)
Publication Information
Korean Journal of Food Science and Technology / v.47, no.1, 2015 , pp. 87-94 More about this Journal
Abstract
High voltage pulsed electric fields (PEF) treatment is one of the more promising nonthermal technologies to fully or partially replace thermal processing. The objective of this research was to investigate the microbial inactivation mechanisms of PEF treatment in terms of intra- and extracellular changes in the cells. Saccharomyces cerevisae cells treated with PEF showed cellular membrane damage. This resulted in the leakage of UV-absorbing materials and intracelluar ions, which increased with increasing treatment time and electric fields strength. This indicates that PEF treatment causes cell death via membrane damage and physical rupture of cell walls. We further confirmed this by Phloxine B staining, a dye that accumulates in dead cells. Using scanning and transmission electron microscopy, we observed morphological changes as well as disrupted cytoplasmic membranes in PEF treated S. cerevisae cells. In addition, PEF treatment led to damaged chromosomal DNA in S. cerevisiae.
Keywords
high voltage pulsed electric fields; inactivation mechanism; nonthermal technology; Saccharomyces cerevisia; chromosomal DNA;
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