Modeling high pressure inactivation of Escherichia coli and Listeria innocua in whole milk

Buzrul S., ALPAS H., Largeteau A., DEMAZEAU G.

EUROPEAN FOOD RESEARCH AND TECHNOLOGY, vol.227, no.2, pp.443-448, 2008 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 227 Issue: 2
  • Publication Date: 2008
  • Doi Number: 10.1007/s00217-007-0740-7
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.443-448
  • Keywords: high hydrostatic pressure, Escherichia coli, Listeria innocua, milk, Weibull model, predictive microbiology, HIGH HYDROSTATIC-PRESSURE, THERMAL INACTIVATION, SURVIVAL CURVES, WEIBULL MODEL, DESCRIBE, HEAT, STERILIZATION, MONOCYTOGENES, PATHOGENS, KINETICS
  • Middle East Technical University Affiliated: Yes


The survival curves of Escherichia coli and Listeria innocua inactivated by high hydrostatic pressure (HHP) were obtained at room temperature (similar to 22 degrees C) and at five pressure levels (400, 450, 500, 550 and 600 MPa) in whole milk. These curves were described by the Weibull model and parameters of this model were reduced from two to one with slight loss of goodness-of-fit. The logarithm of the time constant parameter (delta) of the reduced Weibull model was described with respect to high pressure (P). This approach can be used to define a z(p) value analogous to the modeling of the classical D value (increase in pressure that results in one log unit decrease of delta values). The development of accurate survival models under high pressure, as presented here, can be very beneficial to food industry for designing, evaluating and optimizing HHP processes as a new preservation technology.