High pressure inactivation of Enterococcus faecium - modelling and verification

Aleš Landfeld, Jan Strohalm, Karel Kýhos, Jiřina Průchová, Milan Houška, Pavla Novotná, Ljuba Schlemmerová, Hana Šmuhařová, Vladimir Špelina, Pavel Čermák, Kveta Pavlišová and Pavel Měřicka
Additional contact information
Aleš Landfeld: Food Research Institute Prague, Prague, Czech Republic
Jan Strohalm: Food Research Institute Prague, Prague, Czech Republic
Karel Kýhos: Food Research Institute Prague, Prague, Czech Republic
Jiřina Průchová: Food Research Institute Prague, Prague, Czech Republic
Milan Houška: Food Research Institute Prague, Prague, Czech Republic
Pavla Novotná: Food Research Institute Prague, Prague, Czech Republic
Ljuba Schlemmerová: National Institute of Public Health, Prague, Czech Republic
Hana Šmuhařová: National Institute of Public Health, Prague, Czech Republic
Vladimir Špelina: National Institute of Public Health, Prague, Czech Republic
Pavel Čermák: University Hospital Hradec Kralove, Hradec Kralové, Czech Republic
Kveta Pavlišová: University Hospital Hradec Kralove, Hradec Kralové, Czech Republic
Pavel Měřicka: University Hospital Hradec Kralove, Hradec Kralové, Czech Republic

Czech Journal of Food Sciences, 2009, vol. 27, issue 2, 134-141

Abstract: High-pressure inactivation data were obtained for model working suspensions of Enterococcus faecium in saline solutions in pH range from 5.5 to 6.8, at water activity 0.99 (corresponding to the saline solution). The data were predicted for the pressure range of 450 MPa to 550 MPa, at the initial model suspension temperature 6-7°C prior to pressurising. The results indicate that E. faecium is a highly resistant organism under physiological pH values. With decreasing the substrate pH, the tolerance to the inactivation effects of high pressure decreased. The high-pressure inactivation proved ineffective for the above organism in the range of physiological pH values. The values for high-pressure inactivation model were specified and the calculated parameters of high-pressure inactivation were compared to the experimental data for the working suspensions of E. faecium in cow and human milks. As to cow milk, the predicted data showed some deviation from the model experimental results, while with human milk the model failed completely. High-pressure inactivation of E. faecium in human milk proved to be significantly more effective than that predicted by a model based on the saline solution.

Keywords: high pressure inactivation; Enterococcus faecium; model; verification (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:1052-cjfs

DOI: 10.17221/1052-CJFS

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