TABLE 5.
Populations of S. enterica serotype Poona recovered from lettuce inoculated with the pathogen followed by drying for 1 or 24 h at 37°C before treatment with chemical sanitizers
| Treatment | Concn of chemical (μg/ml) | Population size (log10 CFU/piece of lettuce)a and amt of population reduction atb:
|
|||
|---|---|---|---|---|---|
| 1 h
|
25 h
|
||||
| Population size | Reduction | Population size | Reduction | ||
| Water (control) | 0 | A 7.18 A | B 6.45 A | ||
| Chlorine | 50 | A 6.44 B | 0.74 | A 6.35 A | 0.10 |
| 200 | A 5.99 B | 1.19 | B 5.57 B | 0.88 | |
| Sanova | 850 | B 4.67 B | 2.51 | A 5.15 B | 1.30 |
| 1,200 | A 4.34 B | 2.84 | A 4.19 B | 2.26 | |
| Tsunami 200 | 20 | A 5.44 B | 1.70 | A 5.05 B | 1.40 |
| 40 | A 5.07 B | 2.11 | A 5.01 B | 1.44 | |
a
The population of S. enterica serotype Poona was 7.86 log10 CFU/20 μl of inoculum deposited on each piece of lettuce. Values in the same column followed by the same letter are not significantly different (α = 0.05). Values in the same row preceded by the same letter are not significantly different (α = 0.05).
b
Within the drying time, reduction (log10 CFU/piece of lettuce) compared to results for treating lettuce with water.