A thermodynamic approach to assess a cellular mechanism of inactivation and the thermal resistance of Listeria innocua

In order to link kinetic data of isothermally inactivated planktonic cells to the enthalpy changes observed in pellet analysed in the DSC, two strains of Listeria innocua were investigated. Isothermal inactivation of planktonic cells showed z-values of 4.71oC for L. innocua ATCC 33090 and 5.15oC for...

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Bibliographic Details
Published inProcedia food science Vol. 1; pp. 972 - 978
Main Authors Skåra, Torstein, Cappuyns, Astrid M, Johnsen, Sissel O, Van Derlinden, Eva, Rosnes, Jan Thomas, Olsen, Øystein, Impe, Jan FM Van, Valdramidis, Vasilis P
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 2011
Subjects
Differential Scanning Calorimetry
inactivation
Listeria
ribosome denaturation
Listeria
Differential Scanning Calorimetry
inactivation
ribosome denaturation
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Summary:In order to link kinetic data of isothermally inactivated planktonic cells to the enthalpy changes observed in pellet analysed in the DSC, two strains of Listeria innocua were investigated. Isothermal inactivation of planktonic cells showed z-values of 4.71oC for L. innocua ATCC 33090 and 5.15oC for CCUG 35613(= ATCC 51742). The results of the DSC analyses showed a linearly decreasing remaining enthalpy with increasing dynamic preheating temperature (from 20 to 66-80oC). Deriving equivalent isothermal temperatures, the temperature profiles could be directly correlated with the microbial enthalpy changes, indicating that ribosome denaturation is not the inactivation mechanism for the low thermal treatments studied.
ISSN:2211-601X
2211-601X
DOI:10.1016/j.profoo.2011.09.146