There have been no reports of particular resistant microorganisms
or pathogen strains with unique resistance to the
technology, the most resistant pathogens would likely be
the same as those for thermal processes (USA-FDA, 2000).
Pereira et al. (2007) have reported lower D and z values
for the inactivation of E. coli and B. licheniformis when
submitted to ohmic heating. In this research, comparing
conventional against ohmic heating, the thermal history
of the samples analyzed was adjusted to match. The D
values observed for E. coli at 65 C were 3.5 0.2 and
0.86 min for conventional and ohmic process respectively.
The z values were also reported as 23.1 and 8.4 C respectively.
The observed results indicate that the electric current
may have affected the microbial death rate (Pereira et al.,
2007). Similar observations were obtained in the same
study for the spore inactivation of B. licheniformis. Considering
both microorganisms strain, ohmic heating presented
a lower D value. This fact indicates that an additional nonthermal
lethal effect occurred under ohmic heating, due to
the presence and effects of the electric current over vegetative
cells of E. coli and bacterial spores of B. licheniformis
There have been no reports of particular resistant microorganismsor pathogen strains with unique resistance to thetechnology, the most resistant pathogens would likely bethe same as those for thermal processes (USA-FDA, 2000).Pereira et al. (2007) have reported lower D and z valuesfor the inactivation of E. coli and B. licheniformis whensubmitted to ohmic heating. In this research, comparingconventional against ohmic heating, the thermal historyof the samples analyzed was adjusted to match. The Dvalues observed for E. coli at 65 C were 3.5 0.2 and0.86 min for conventional and ohmic process respectively.The z values were also reported as 23.1 and 8.4 C respectively.The observed results indicate that the electric currentmay have affected the microbial death rate (Pereira et al.,2007). Similar observations were obtained in the samestudy for the spore inactivation of B. licheniformis. Consideringboth microorganisms strain, ohmic heating presenteda lower D value. This fact indicates that an additional nonthermallethal effect occurred under ohmic heating, due tothe presence and effects of the electric current over vegetativecells of E. coli and bacterial spores of B. licheniformis
การแปล กรุณารอสักครู่..