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) | |