Sourcies of the inactivation kinetic nonlinearity for microorganisms under pressure
Abstract
The physical reasons of observable deviations of the inactivation kinetics from linearity are analyzed for the high pressure processing of microorganisms in food samples. It is shown, that insignificant heating of samples by compression leads under some conditions to increase of the reaction rate constant from 2 up to 5 times. Solving the heat transfer equation the deviations from the linear law, arising due to non-uniform cooling of the sample during of the pressure processing are calculated. It is shown, that the kinetic curves received within the framework of the linear equation model might have nonlinear biphasic character due at account of cooling. Amendments to inactivation curves for MAFAM are estimated. It is drawn a conclusion that deviations from linearity can arise within the linear model at the account of non-stationary spatially non-uniform distribution of temperature inside of the sample.
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References
Noga IV. Termodinamika vozdeistviia vysokogo davleniia i temperatury na mikroorganizmy i vitaminy. Fizika i tekhnika vysokikh davlenii. Donetck: DonFTI NANU; 2006. p. 126-36. (in Russian)
Merkulow N, Ludwig H. The influence of high hydrostatic pressure on the adduct formation of patulin with cysteine. Progress in Biotechology. 2002;19(1):664.
Heinz V, Knorr D. High pressure inactivation kinetics of Bacillus subtilis cells by a three-state-model considering distributed resistance mechanisms. Food Biotechnology. 1996;;10(2):149-61.
Patterson MF, Kilpatrick DJ. The combined effect of high hydrostatic pressure and mild heat on inactivation of pathogens in milk and poultry. J. Food Prot. 1998;61(4):432-6.
Reyns KMFA, Soontjens CCF, Cornelis K, Weemaes CA, Hendrickx ME, Michiels CW. Kinetic analysis and modeling of combined high-pressure-temperature inactivation of the yeast Zygosaccharomyces bailii. Int. J. Food Microbiol. 2000;56:199-210.
Ardia A. Process Considerations on the Application of High Pressure Treatment at Elevated Temperature Levels for Food Preservation: Genehm. Berlin:Technichen Univers; 2004. 94p.
Tikhonov AN, Samarskii AA. Uravneniia matematicheskoi fiziki. M.:Nauka; 1972. 736p.(in Russian)
Solodov AP, Ochkov VF. Differentcialnye modeli. M.:MEI; 2002. 239p. (in Russian)
Aleksandrova AA, Grigoreva BA. Tablitcy teplofizicheskikh svoistv vody i vodianogo para: Spravochnik. M.:Izdatelstvo MEI; 1999. 168p. (in Russian)
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