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Nature of the Inactivation Curves of Bacillus Pumilus Spores Heated Using Non‐isothermal and Isothermal Treatments
Author(s) -
Ruiz P.,
Ocio M.J.,
Cardona F.,
Fernández A.,
Rodrigo M.,
Martínez A.
Publication year - 2002
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.2002.tb10675.x
Subject(s) - isothermal process , spore , bacillus pumilus , population , materials science , thermodynamics , chemistry , biology , microbiology and biotechnology , physics , medicine , bacteria , genetics , environmental health
Isothermal and non‐isothermal heat resistance studies were carried out on Bacillus pumilus spores. The non‐isothermal study revealed a non‐linear behavior of the survivor curve, which was revealed as a tail after an isothermal study. Results indicated that the spores obtained by isolating cells from colonies of the tail section were more heat resistant than the original ones (D 104°c = 0.15 and 1.9 min for spores from the original population and from the tail, respectively). Application of the Weibull distribution model to analyze the tail produced good results at the 3 temperatures studied. Nevertheless, when the model was applied to curves having both concave downward and concave upward sections a poor result was obtained, with an accuracy factor greater than 1.