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Baroinactivation of Staphylococcus epidermidis - mathematical model and its verification using human and cow milk

Author

Listed:
  • Ljuba Schlemmerová

    (State Health Institute Prague, Czech Republic)

  • Milan Houška

    (Food Research Institute Prague, Prague, Czech Republic)

  • Vladimir Špelina

    (State Health Institute Prague, Czech Republic)

  • Jan Strohalm

    (Food Research Institute Prague, Prague, Czech Republic)

  • Aleš Landfeld

    (Food Research Institute Prague, Prague, Czech Republic)

  • Hana ŠmuhaŘová

    (State Health Institute Prague, Czech Republic)

  • Ilona Němcová

    (State Health Institute Prague, Czech Republic)

  • Karel Kýhos

    (Food Research Institute Prague, Prague, Czech Republic)

  • Jiřina Průchová

    (Food Research Institute Prague, Prague, Czech Republic)

  • Pavla Novotná

    (Food Research Institute Prague, Prague, Czech Republic)

  • Pavel Měřička

    (University Hospital Hradec Králové, Hradec Králové, Czech Republic)

Abstract

Staphylococcus epidermidis, commonly found on the human skin, may contaminate human milk. High-pressure pasteurisation of human milk under normal temperature preserves the majority of its protective agents. The objective of this study was to acquire baroinactivation data and develop a model for model solutions of pH = 6.4 to 7.2 and water activity aw = 0.99, in which baroinactivation of Staphylococcus epidermidis takes place. Decontamination data manifested exponential kinetics and the resulting model was described by the following equations: Dp = Dp, ref × 10 (Pref - P)/Z, Z = -123.90 pH2 + 1635.54 pH - 5210.49; Dp, ref = -8.89 pH2 + 121.02 pH - 408.34. The developed model was verified using pasteurised human milk and UHT-treated skimmed cow milk. The agreement between the experimental data and model-based prediction was very good for human milk. It was proved that the application of a pressure of 350 MPa for 10 min decreased the concentration of the working suspension of S. epidermidis in the model substrate by a minimum of five orders.

Suggested Citation

  • Ljuba Schlemmerová & Milan Houška & Vladimir Špelina & Jan Strohalm & Aleš Landfeld & Hana ŠmuhaŘová & Ilona Němcová & Karel Kýhos & Jiřina Průchová & Pavla Novotná & Pavel Měřička, 2009. "Baroinactivation of Staphylococcus epidermidis - mathematical model and its verification using human and cow milk," Czech Journal of Food Sciences, Czech Academy of Agricultural Sciences, vol. 27(2), pages 118-126.
    • Handle: RePEc:caa:jnlcjf:v:27:y:2009:i:2:id:1051-cjfs
    DOI: 10.17221/1051-CJFS
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