Strainsa | TVC | COLI | E.coli | S. aureus | Sal | Listeria | |
---|---|---|---|---|---|---|---|
Incubation temperature (℃) | 30 | 37 | 37 | 37 | 37 | 37 | |
- | BLUE | RED | RED | RED | RED | BLUE | |
+ | YELLOW | YELLOW | YELLOW | YELLOW | YELLOW | YELLOW | |
bacterial concentration | CFU/ml or CFU/g | Discoloration time(h) | |||||
1 × 107 | < 3.0 | < 4.0 | < 4.3 | < 7.3 | < 4.0 | < 7.3 | |
1 × 106 | 3.0 | 4.0 | 4.3 | 7.3 | 4.0 | 7.3 | |
1 × 105 | 5.3 | 6.3 | 7.3 | 11.0 | 4.3 | 12.0 | |
1 × 104 | 8.0 | 9.3 | 10.0 | 20.0 | 8.3 | 16.3 | |
1 × 103 | 11.0 | 12.3 | 13.0 | 29.3 | 13.3 | 20.3 | |
1 × 102 | 14.0 | 16.0 | 16.0 | 36.0 | 18.0 | 25.0 | |
1 × 101 | 16.0 | 19.0 | 19.0 | 43.0 | 23.0 | 29.0 | |
1 | 18.0 | 22.0 | 22.0 | 46.0 | 28.0 | 33.0 | |
0 | > 20.0 | > 24.0 | > 24.0 | > 48.0 | > 32.0 | > 36.0 |