Modeling the synergistic effect of high pressure and heat on inactivation kinetics of Listeria innocua: a preliminary study

FEMS Microbiology Letters
Sencer Buzrul, H Alpas

Abstract

The survival curves of Listeria innocua CDW47 by high hydrostatic pressure were obtained at four pressure levels (138, 207, 276, 345 MPa) and four temperatures (25, 35, 45, 50 degrees C) in peptone solution. Tailing was observed in the survival curves. Elevated temperatures and pressures substantially promoted the inactivation of L. innocua. A linear and two non-linear (Weibull and log-logistic) models were fitted to these data and the goodness of fit of these models were compared. Regression coefficients (R2), root mean square (RMSE), accuracy factor (Af) values and residual plots suggested that linear model, although it produced good fits for some pressure-temperature combinations, was not as appropriate as non-linear models to represent the data. The residual and correlation plots strongly suggested that among the non linear models studied the log-logistic model produced better fit to the data than the Weibull model. Such pressure-temperature inactivation models form the engineering basis for design, evaluation and optimization of high hydrostatic pressure processes as a new preservation technique.

References

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Citations

Jan 7, 2011·Extremophiles : Life Under Extreme Conditions·I V Ambily Nath, P A Loka Bharathi
Feb 8, 2011·Journal of Industrial Microbiology & Biotechnology·G C MendesC L M Silva
Sep 8, 2010·Applied and Environmental Microbiology·Guillermo CebriánSantiago Condón
Jan 5, 2011·Applied and Environmental Microbiology·Lixiong LiKathryn L Mintz
May 6, 2008·International Journal of Food Microbiology·Sencer BuzrulGérard Demazeau
Jan 3, 2006·International Journal of Food Microbiology·M Dilek AvsarogluFaruk Bozoglu

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