Articles
STATE-OF-THE-ART IN QUANTIFYING THE EFFECT OF PULSED ELECTRIC FIELDS ON MICRO-ORGANISMS
Article number
566_12
Pages
115 – 121
Language
English
Abstract
In this research, the focus is on quantification of microbial inactivation as induced by a pulsed electric field process.
Based on an analysis of (i) the most important processing factors, (ii) the properties of two data sets extracted from the literature, and (iii) general observations, a set of model requirements is formulated.
These model requirements are the basis for evaluating three literature models: (i) the widely used approach of Hülsheger et al., 1981 (Hülsheger, H., Potel, J. and Niemann, E.-G. 1981. Radiat.
Environ.
Biophys. 20:53-65), (ii) the model of Peleg, 1995 (Peleg, M. 1995. J. Sci.
Food Agric. 67:93-99), and (iii) the model of Raso et al., 2000 (Raso J., Alvarez, I., Condón, S. and Trepat, F.J.S. 2000. Innovat.
Food Sci. & Emerg.
Technol. 1:21-29). It is shown that all three modelling approaches have their inherent structural limitations.
A biphasic model prototype is proposed which encompasses loglinear inactivation, and which at the same time can be extended towards multiphasic inactivation curves.
The reducibility and extendibility are important model requirements.
The model incorporates the effect of electric field strength and treatment time and is tested against two data sets from literature.
Further research is needed about the influence of the electric field strength on the extent of microbial inactivation.
Based on an analysis of (i) the most important processing factors, (ii) the properties of two data sets extracted from the literature, and (iii) general observations, a set of model requirements is formulated.
These model requirements are the basis for evaluating three literature models: (i) the widely used approach of Hülsheger et al., 1981 (Hülsheger, H., Potel, J. and Niemann, E.-G. 1981. Radiat.
Environ.
Biophys. 20:53-65), (ii) the model of Peleg, 1995 (Peleg, M. 1995. J. Sci.
Food Agric. 67:93-99), and (iii) the model of Raso et al., 2000 (Raso J., Alvarez, I., Condón, S. and Trepat, F.J.S. 2000. Innovat.
Food Sci. & Emerg.
Technol. 1:21-29). It is shown that all three modelling approaches have their inherent structural limitations.
A biphasic model prototype is proposed which encompasses loglinear inactivation, and which at the same time can be extended towards multiphasic inactivation curves.
The reducibility and extendibility are important model requirements.
The model incorporates the effect of electric field strength and treatment time and is tested against two data sets from literature.
Further research is needed about the influence of the electric field strength on the extent of microbial inactivation.
Authors
A.H. Geeraerd, P.C. Wouters, J.F. Van Impe
Keywords
microbial inactivation, PEF process, model requirements, loglinear model, biphasic model, multiphasic model
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