High pressure inactivation of Enterococcus faecium - modelling and verification

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. The data were predicted for the pressure range of 450 MPa to 550 MPa, at the initial model suspension temperature 6-7 deg C pri...

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Bibliographic Details
Published in:Czech Journal of Food Sciences 2009-01, Vol.27 (2), p.134-141
Main Authors: Landfeld, A.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic), Strohalm, J.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic), Kyhos, K.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic), Pruchova, J.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic), Houska, M.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic), Novotna, P.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic), Schlemmerova, L.,Statni Zdravotni Ustav, Prague (Czech Republic), Smuharova, H.,Statni Zdravotni Ustav, Prague (Czech Republic), Spelina, V.,Statni Zdravotni Ustav, Prague (Czech Republic), Cermak, P.,Fakultni Nemocnice, Hradec Kralove (Czech Republic), Pavlisova, K.,Fakultni Nemocnice, Hradec Kralove (Czech Republic), Mericka, P.,Fakultni Nemocnice, Hradec Kralove (Czech Republic)
Format: Article
Language:English
Subjects:
Breast milk
CELL CULTURE
Cow's milk
CULTIVO DE CELULAS
CULTURE DE CELLULE
CULTURE MEDIA
CULTURE TECHNIQUES
Deactivation
ENTEROCOCCUS
Enterococcus faecium
High pressure
high pressure inactivation
HIGH PRESSURE TECHNOLOGY
http://www.fao.org/aos/agrovoc#c_10204
http://www.fao.org/aos/agrovoc#c_15967
http://www.fao.org/aos/agrovoc#c_16085
http://www.fao.org/aos/agrovoc#c_16606
http://www.fao.org/aos/agrovoc#c_24199
http://www.fao.org/aos/agrovoc#c_24396
http://www.fao.org/aos/agrovoc#c_36742
http://www.fao.org/aos/agrovoc#c_5753
http://www.fao.org/aos/agrovoc#c_7178
HUMAN MILK
Inactivation
LAIT HUMAIN
LECHE HUMANA
MATHEMATICAL MODELS
MEDIO DE CULTIVO
MILIEU DE CULTURE
Milk
MODELE MATHEMATIQUE
MODELOS MATEMATICOS
pH effects
Physiology
Pressure
Pressure effects
Saline solutions
STREPTOCOCCUS FAECIUM
Substrates
TECHNIQUE DE CULTURE
TECHNOLOGIE HAUTE PRESSION
TECNICAS DE CULTIVO
TECNOLOGIA ALTA PRESION
verification
Water activity
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Summary: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. The data were predicted for the pressure range of 450 MPa to 550 MPa, at the initial model suspension temperature 6-7 deg 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.
ISSN:1212-1800
1805-9317
DOI:10.17221/1052-CJFS