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Abstract
Differential scanning calorimetry (DSC) was used to evaluate the relative high hydrostatic
pressure (HHP) resistances of bacterial strains from Staphylococcus aureus and Escherichia
coli O157:H7 in vivo. The total apparent enthalpy change and thermal stability were
two DSC parameters used to compare bacterial strains of untreated control and pressure-treated
bacteria. DSC thermograms indicated that ribosomal denaturation appears to be a major
factor in cell death by both thermal and high pressure treatments. However, the analysis
of calorimetric data for control samples as well as pressure-treated samples clearly
showed that the sensitivities of bacteria to various physical stresses can be different.
While S. aureus 765 had a relatively higher resistance to thermal treatment in comparison
to S. aureus 485, S. aureus 485 was determined to be more resistant to pressure than
S. aureus 765. This information can be utilized in the design of processes specific
to targeting certain cellular components by using different physical stresses.