Table 1.
The fitted parameters of inactivation kinetics for Geeraerd, biphasic, and log-linear models for tested microorganisms treated by MSDBD plasma generated in different process gases.
| Process gasses | Parameters | E. coli | S. Enteritidis | B. subtilis |
|---|---|---|---|---|
| Ambient air | log N0 (CFU/ml) | 8.2 ± 0.4 | 8.2 ± 0.4 | 8.0 ± 0.2 |
| Model | Geeraerd | Geeraerd | biphasic | |
| kmax1 (s−1) | 1.0 ± 0.2 | 0.8 ± 0.2 | 0.8 ± 0.1 | |
| kmax2 (s−1) | NA | NA | 0.12 ± 0.03 | |
| log Nres (CFU/ml) | 3.8 ± 0.5 | 3.9 ± 0.5 | NA | |
| f | NA | NA | 0.991 (0.007) | |
| D1-value (s) | 1.0 ± 0.2 | 1.2 ± 0.2 | 1.3 ± 0.2 | |
| D2-value (s) | NA | NA | 8 ± 2 | |
| O2 | log N0 (CFU/ml) | 8.7 ± 0.1 | 8.7 ± 0.1 | 7.8 ± 0.3 |
| Model | Biphasic | Biphasic | Biphasic | |
| kmax1 (s−1) | 1.0 ± 0.1 | 0.57 ± 0.09 | 0.5 ± 0.1 | |
| kmax2 (s−1) | 0.031 ± 0.003 | 0.036 ± 0.003 | 0.025 ± 0.006 | |
| f | 0.998 (0.001) | 0.989 (0.003) | 0.998 (0.002) | |
| D1-value (s) | 1.0 ± 0.1 | 1.8 ± 0.3 | 2.0 ± 0.5 | |
| D2-value (s) | 33 ± 4 | 28 ± 2 | 40 ± 10 | |
| N2 | log N0 (CFU/ml) | 8.4 ± 0.1 | 8.6 ± 0.1 | 7.91 ± 0.04 |
| Model | log-linear | log-linear | biphasic | |
| kmax1 (s−1) | 0.057 ± 0.003 | 0.026 ± 0.002 | 0.233 ± 0.006 | |
| kmax2 (s−1) | NA | NA | 0.020 ± 0.001 | |
| f | NA | NA | 0.998 (0.001) | |
| D1-value (s) | 17.4 ± 0.8 | 39 ± 3 | 4.3 ± 0.1 | |
| D2-value (s) | – | – | 50 ± 2 |
NA not applicable; *value is calculated.