3.2. Growth of L. monocytogenes on frankfurters during aerobic storage
at 7 °C
Initial counts of L. monocytogenes and total microbial populations on
inoculated control frankfurters were 2.4±0.1 and 2.5±0.1 log CFU/cm2,
respectively. L. monocytogenes counts reached approximately 6.0 log CFU/
cm2 after 14 days of aerobic storage at 7 °C (Figs.1 and 2). Counts onTSAYE
(data not shown) were similar (P≥0.05) to those on PALCAM agar for all
treatments, indicating that the majority of colonies found on TSAYE were
L. monocytogenes and that most microbial reductions caused by salad
dressings or DW immersion treatments was due to physical removal or
death rather than sublethal cell injury (Byelashov et al., 2008).