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

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 mode...

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Bibliographic Details
Published in:Czech Journal of Food Sciences 2009-01, Vol.27 (2), p.118-126
Main Authors: Schlemmerova, L.,Statni Zdravotni Ustav, Prague (Czech Republic), Houska, M.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic), Spelina, V.,Statni Zdravotni Ustav, Prague (Czech Republic), Strohalm, J.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic), Landfeld, A.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic), Smuharova, H.,Statni Zdravotni Ustav, Prague (Czech Republic), Nemcova, I.,Statni Zdravotni Ustav, Prague (Czech Republic), Kyhos, K.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic), Pruchova, J.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic), Novotna, P.,Vyzkumny Ustav Potravinarsky, Prague (Czech Republic), Mericka, P.,Fakultni Nemocnice, Hradec Kralove (Czech Republic)
Format: Article
Language:English
Subjects:
ANALISIS MICROBIOLOGICO
ANALYSE MICROBIOLOGIQUE
BIOLOGICAL CONTAMINATION
CONTAMINACION BIOLOGICA
CONTAMINATION BIOLOGIQUE
COW MILK
HIGH PRESSURE TECHNOLOGY
http://www.fao.org/aos/agrovoc#c_15068
http://www.fao.org/aos/agrovoc#c_16080
http://www.fao.org/aos/agrovoc#c_16085
http://www.fao.org/aos/agrovoc#c_24199
http://www.fao.org/aos/agrovoc#c_25302
http://www.fao.org/aos/agrovoc#c_28318
http://www.fao.org/aos/agrovoc#c_34406
http://www.fao.org/aos/agrovoc#c_36742
http://www.fao.org/aos/agrovoc#c_5623
HUMAN MILK
LAIT DE VACHE
LAIT HUMAIN
LAIT UHT
LECHE DE VACA
LECHE HUMANA
LECHE UHT
MATHEMATICAL MODELS
MICROBIOLOGICAL ANALYSIS
MODELE MATHEMATIQUE
MODELOS MATEMATICOS
PASTEURISATION
PASTEURIZACION
PASTEURIZATION
STAPHYLOCOCCUS EPIDERMIDIS
TECHNOLOGIE HAUTE PRESSION
TECNOLOGIA ALTA PRESION
UHT MILK
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Summary: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 x 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. 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 of magnitude.
ISSN:1212-1800
DOI:10.17221/1051-cjfs