Table 7.
Gases | Plasma treatment time (s) | Microorganisms | |||||
---|---|---|---|---|---|---|---|
E. coli NCTC12900 | L. monocytogenes NCTC11994 | S. aureus NCTC1803 | |||||
Cell density (Log10 CFU ml−1) | SD* | Cell density (Log10 CFU ml−1) | SD* | Cell density (Log10 CFU ml−1) | SD* | ||
1 | C1* | 6.78a | 0.03 | 7.17a | 0.09 | 6.63a | 0.07 |
C2* | 7.18ce | 0.08 | 7.56c | 0.08 | 7.14b | 0.16 | |
60 | 7.64b | 0.13 | 7.28ab | 0.12 | 6.22c | 0.07 | |
120 | 7.49bc | 0.24 | 7.46bc | 0.06 | 6.27c | 0.07 | |
300 | 7.01ae | 0.25 | 7.34ac | 0.20 | 6.15c | 0.12 | |
2 | C1* | 6.98de | 0.05 | 7.02ef | 0.06 | 6.93a | 0.29 |
C2* | 7.15ce | 0.06 | 7.56c | 0.08 | 7.23b | 0.05 | |
60 | 6.87df | 0.06 | 6.98e | 0.04 | 6.73d | 0.12 | |
120 | 6.74f | 0.10 | 7.18f | 0.05 | 6.73d | 0.06 | |
300 | 6.55g | 0.12 | 6.78d | 0.14 | 5.79c | 0.29 | |
3 | C1* | 6.98de | 0.01 | 6.99e | 0.03 | 6.81a | 0.06 |
C2* | 7.23ce | 0.05 | 7.56c | 0.08 | 7.17b | 0.19 | |
60 | 6.47h | 0.14 | 6.55h | 0.22 | 5.85c | 0.35 | |
120 | 5.93i | 0.11 | 5.97g | 0.03 | 5.54e | 0.13 | |
300 | 5.49j | 0.17 | 4.77i | 0.05 | 4.63f | 0.11 |
SD*, standard deviation; C1*, Control without storage; C2*, Control with storage. Different letters indicate a significant difference at the 0.05 level between gas mix and treatment times. Gases: 1 30% CO2+70% N2; 2 Air; 3 30% CO2+70% O2.