Table 2.
Bactericidal activity of different concentrations of the essential oil of Myrrh against three standard bacterial strains tested by surface viable count method
| Test organism | Contact time (h) | Essential oil (%) | |||
|---|---|---|---|---|---|
| 0 | 1 | 2 | 5 | ||
| Viable count, CFU/mla (% killing) | |||||
| S. aureus (ATCC 6538) | 0.0 | 8.5 × 107 | 8.5 × 107 | 8.5 × 107 | 8.5 × 107 |
| 0.5 | – |
8.0 × 107 (6.88) |
6.8 × 107 (20.00) |
5.7 × 107 (32.94) |
|
| 2.0 | – |
5.4 × 105 (99.36) |
2.47 × × 105 (99.71) |
2.0 × 101 (> 99.999) |
|
| 24.0 | 3.3 × 108 |
< 2.0 × 101 (> 99.999) |
< 2.0 × 101 (> 99.999) |
< 2.0 × 101 (> 99.999) |
|
| E. coli (ATCC 8739) | 0.0 | 8.0 × 107 | 8.0 × 107 | 8.0 × 107 | 8.0 × 107 |
| 2.0 | – |
4.3 × 107 (44.25) |
3.1 × 107 (73.75) |
1.95 × 107 (75.61) |
|
| 24.0 | 1.8 × 108 |
2.7 × 106 (98.50) |
3.0 × 104 (99.983) |
> 2.0 × 101 (> 99.999) |
|
| Ps. aeruginosa (ATCC 9027) | 0.0 | 5.0 × 107 | 5.0 × 107 | 5.0 × 107 | 5.0 × 107 |
| 0.5 | – |
3.7 × 107 (30.00) |
2.85 × 107 (43.00) |
2.95 × 106 (94.10) |
|
| 2.0 | – |
< 2.0 × 101 (> 99.999) |
< 2.0 × 101 (> 99.999) |
< 2.0 × 101 (> 99.999) |
|
aAverage of three determinations carried out by surface viable count method at RT (24 °C)