Abstract
The inactivation kinetics of two yeasts, Saccharomyces cerevisiae CCRC 20271 and Zygosaccharomyces rouxii CCRC 21873, were determined at combinations of different hydrostatic pressures (0·1–300 MPa) and temperatures (35–55°C). First order kinetics were applicable to both yeasts under the conditions used, except that slight deviations occurred for Z. rouxii at combinations of 35–40°C and 150–300 MPa. At pressures of 0·1 to 100 MPa S. cerevisiae was more resistant to heat and also to pressure than Z. rouxii. The Arrhenius plots of the specific death rates for both yeasts at various pressures showed similar yet distinct patterns. The average activation energy ( E a) for Z. rouxii was about 1·51 ± 0·08 × 10 5 J/mol and was apparently independent of pressure, however, E a values of S. cerevisiae were roughly divided into two groups of parallel lines, one obtained at pressures of 0·1–100 MPa was 1·65 ± 0·61 × 10 4 J/mol, the other was 1·23 ± 0·17 × 10 5 J/mol at 150–300 MPa. Consequently, the combined effect of pressure and temperature on the survival of the yeasts appeared to be additive, but this effect tended to increase stepwise for S. cerevisiae as the pressure increased.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.