Table 2.
Mean values for the reduction in Escherichia coli O157:H7 counts (log N0/N) in different combinations of gas concentration (C) and exposure period (P) on different substrates (S)
| C(mg L−1)/P(min) | S | |||||
|---|---|---|---|---|---|---|
| UHWM | HWM | SM | LFSM | LFWM | DW | |
| 35/5 | 0.24 ± 0.04 cd | 0.23 ± 0.02 cd | 0.02 ± 0.07d | 0.66 ± 0.12b | 0.27 ± 0.02c | 3.98 ± 0.01a |
| 35/15 | 0.38 ± 0.10 cd | 0.20 ± 0.04de | 0.03 ± 0.04e | 0.82 ± 0.23b | 0.44 ± 0.07c | 3.98 ± 0.01a |
| 35/25 | 0.89 ± 0.17c | 0.29 ± 0.06d | 0.10 ± 0.04d | 1.53 ± 0.34b | 0.65 ± 0.17c | 3.97 ± 0.02a |
| 45/5 | 0.26 ± 0.06c | 0.28 ± 0.04c | 0.01 ± 0.01d | 0.78 ± 0.07b | 0.46 ± 0.09c | 3.95 ± 0.04a |
| 45/15 | 0.41 ± 0.11 cd | 0.30 ± 0.05d | 0.03 ± 0.02e | 0.86 ± 0.23b | 0.56 ± 0.02c | 3.94 ± 0.04a |
| 45/25 | 0.96 ± 0.31c | 0.38 ± 0.09d | 0.11 ± 0.05e | 1.54 ± 0.09b | 0.73 ± 0.06c | 3.90 ± 0.02a |
Means followed by the lower case letters (a–e) on the line do not statistically differ by the Tukey test at 5% probability
UHWM, unhomogenized whole milk; HWM, homogenized whole milk; SM, skim milk; LFSM, lactose-free skim milk; LFWM, lactose-free whole milk; DW, distilled water
n = 3 sample replicates