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Statistical analysis of inactivation of Listeria monocytogenes subjected to high hydrostatic pressure and heat in milk buffer

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Abstract

Previous unpublished experimental results of fractional factorial experiments showed that significant external factors affecting high-pressure processing (HPP) inactivation were pressure, temperature, and pressure holding time. Based on these results, response surface methodology (RSM) was employed in the present work, and a quadratic equation for HPP inactivation was built with RSM. By analyzing response surface plots and their corresponding contour plots and by solving the quadratic equation, experimental values were shown to be significantly in good agreement with predicted values, since the adjusted determination coefficient (RAdj2) was 0.9812 and the level of significance was P<0.0001. Optimum process parameters for a 6-log cycle reduction of Listeria monocytogenes were obtained: pressure, 448.0 MPa; temperature, 41°C; and pressure holding time, 11 min. The adequacy of the model equation in predicting optimum response values was verified effectively by validation data.

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Correspondence to Yu-Long Gao.

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Gao, Y., Ju, X. & Jiang, H. Statistical analysis of inactivation of Listeria monocytogenes subjected to high hydrostatic pressure and heat in milk buffer. Appl Microbiol Biotechnol 70, 670–678 (2006). https://doi.org/10.1007/s00253-005-0143-2

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Keywords

  • Response Surface Methodology
  • Listeria Monocytogenes
  • High Hydrostatic Pressure
  • Mild Heat
  • Cycle Reduction