Survival tests: | | |
Survival at different pH levels (for 4 h) | pH 2 | ++ |
pH 3 | +++ |
pH 4 | +++ |
pH 5 | +++ |
pH 6 | +++ |
pH 7 | +++ |
Control1) | +++ |
Survival at bile salts for 6 h | 0.3% | +++ |
0.5% | +++ |
1.0% | +++ |
Control1) | +++ |
Survival (%) in simulated gastric juice (for 4 h) | pH 2 | 93.0±1.2 |
Survival (%) in simulated gastrointestinal juice (for 6 h) | pH 7 | 78.0±1.5 |
Cell surface hydrophobicity (%) | | 85.0±4.2 |
Auto-aggregation (%) | 1 h | 48.3±1.3 |
2 h | 51.1±0.9 |
4 h | 59.4±0.5 |
Co-aggregation (%) | 1 h | 35.1±1.3 |
2 h | 36.8±0.9 |
4 h | 37.4±0.5 |
DPPH scavenging activity (%) | | 71.0±2.9 |
ABTS scavenging activity (%) | | 54.1±1.5 |
Virulence factors: | | |
DNase production | | np |
Hemolysin production | | np |