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

Ljuba Schlemmerová, Milan Houška, Vladimir Špelina, Jan Strohalm, Aleš Landfeld, Hana ŠmuhaŘová, Ilona Němcová, Karel Kýhos, Jiřina Průchová, Pavla Novotná and Pavel Měřička
Additional contact information
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

Czech Journal of Food Sciences, 2009, vol. 27, issue 2, 118-126

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.

Keywords: Staphylococcus epidermidis; baroinactivation; human milk (search for similar items in EconPapers)
Date: 2009
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjf:v:27:y:2009:i:2:id:1051-cjfs

DOI: 10.17221/1051-CJFS

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