The effect of high hydrostatic pressure on the survival of<i>Saccharomyces cerevisiae</i>in model suspensions and beetroot juice

Abstract

Abstract The inactivation of Saccharomyces cerevisiae NCFB 3191 using high hydrostatic pressure of 300 MPa at 20°C with a holding time of 0, 1, 5 and 10 min was investigated with model suspensions in phosphate-buffered saline and in beetroot juice. The reduction in S. cerevisiae NCFB 3191 in model suspensions was about 5 log after 10 min of pressurization, irrespective of the initial level of cell concentration in the samples (5.4–8.7 log cfu/mL). The baroprotective effect of beetroot juice on yeast cells during pressurization was observed; the reduction was lower and was only 3.5 log (the inoculum was 5.4 log cfu/mL). No sublethal injury among the surviving cells of the studied yeast strain was found. Keywords: Saccharomyces cerevisiae beetroot juicehigh hydrostatic pressure Acknowledgements The study was financed by the Polish Ministry of Science and Higher Education as grant no. 2011/01/B/NZ9/02537. Notes †This paper was presented at the Lth European High Pressure Research Group (EHPRG 50) Meeting at Thessaloniki, Greece, 16–21 September 2012.