Thermal inactivation kinetics of Bacillus stearothermophilus spores using a linear temperature program

A systematic study of the inactivation kinetics of Bacillus stearothermophilus spores was carried out in nonisothermic heating conditions using a linear temperature increase program and analyzing the experimental data by means of a one-step nonlinear regression. The D and z values estimated are clos...

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Bibliographic Details
Published in:Journal of food protection 1999-08, Vol.62 (8), p.958-961
Main Authors: Leontidis, S, Fernandez, A, Rodrigo, C, Fernandez, P.S, Magraner, L, Martinez, A
Format: Article
Language:English
Subjects:
Bacillus stearothermophilus
bacterial spores
Biological and medical sciences
Colony Count, Microbial
Disinfection - methods
Food industries
Food microbiology
Fundamental and applied biological sciences. Psychology
Geobacillus stearothermophilus - physiology
heat treatment
Hot Temperature
mathematical models
methodology
microbial activity
mortality
Spores, Bacterial - physiology
Temperature
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Summary:A systematic study of the inactivation kinetics of Bacillus stearothermophilus spores was carried out in nonisothermic heating conditions using a linear temperature increase program and analyzing the experimental data by means of a one-step nonlinear regression. The D and z values estimated are close to those obtained in isothermic conditions and estimated by using a two-step model, first D values are calculated, and then in the second step a z value is deduced (D(121 degrees C) = 3.08 and 4.38 min, respectively, and z = 7 and 7.9 degrees, C, respectively). No convergence problems were observed when using the one-step nonlinear regression proposed. The results indicated that the methodology applied in this study can be used to obtain kinetic data for bacterial spores, which could mean a significant reduction in the amount of experimental work employed to generate these data.
ISSN:0362-028X
1944-9097
DOI:10.4315/0362-028X-62.8.958