Table 2.
Effect of cold plasma treatment on Gram-positive bacteria inoculated onto the surface of agarized medium. Values with different letters (a–c) within the same column differ significantly (P < 0.05)
| Type of plasma | Exposure time (min) | Log reduction | ||||
|---|---|---|---|---|---|---|
| Bacillus subtilis | Micrococcus luteus | Staphylococcus aureus | Listeria monocytogenes | Lactobacillus acidophilus | ||
| Helium | 2 | 1.92 ± 0.08 b | 0.52 ± 0.21 b | 0.64 ± 0.30 b | 0 ± 0.01 a | 0.20 ± 0.02 a |
| 5 | 2.00 ± 0.05 b | 1.06 ± 0.11 c | 1.98 ± 0.04 c | 0.06 ± 0.02 a | 0.53 ± 0.11 b | |
| 10 | 1.97 ± 0.05 b | 1.48 ± 0.09 c | 2.02 ± 0.07 c | 0.11 ± 0.07 a | 0.69 ± 0.08 b | |
| Argon | 2 | 1.79 ± 0.18 b | 0.01 ± 0.01 a | 0.08 ± 0.05 a | 0 ± 0.00 a | 0 ± 0.00 a |
| 5 | 1.98 ± 0.05 b | 0.34 ± 0.09 b | 0.88 ± 0.12 bc | 0 ± 0.01 a | 0 ± 0.01 a | |
| 10 | 2.00 ± 0.07 b | 0.89 ± 0.12 c | 0.96 ± 0.16 bc | 0.09 ± 0.05 a | 0.17 ± 0.1 a | |