Interaction Between Osmotic and Hydrostatic Pressure in Yeast Inactivation
The protective effect of an osmotic perturbation on high-pressure inactivation has been investigated using a yeast strain:Saccharomyces cerevisiae. Osmotic shocks have been carried out with binary medium (glycerol/sorbitol and water) with or without glucose. Variations of osmotic level, osmotic shift kinetics and time between osmotic and hydrostatic treatment (350 MPa/10 min) have allowed the characterization of cell baroprotection. Two different cumulative baroprotection effects have been distinguished: one conferred by the solute on biological structures and the other related to the osmotic stress, cell volume variations and stress metabolism response (HSP, trehalose). These experiments have also exhibited a repair phase, which occurred immediately after the high-pressure treatment and required the presence of glucose.
KeywordsGlycerol Hydration Agar Polyethylene Shrinkage
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