| The used oil | 1 μl/30 ml | 5 μl/30 ml | 10 μl/30 ml | 20 μl/30 ml | 40 μl/30 ml | 80 μl/30 ml |
| Conc. of oil | 0.0133% | 0.0167% | 0.033% | 0.066% | 0.133% | 0.266% |
| M. piperta oil | 80.8% | 22.21% | 14.85% | 0% | 0% | 0% |
| C. citratus oil | 85.35% | 32.32% | 21.71% | 13.6% | 0% | 0% |
| T. vulgaris oil | 91.4% | 67.17% | 29.79% | 18.18% | 0% | 0% |
| O. majoranum oil | 92.42% | 68.68% | 30.80% | 20.20% | 0% | 0% |
| Negative control | 100% | 100% | 100% | 100% | 100% | 100% |
| Positive control | 94.40% | 76.89% | 45.20% | 24.35% | 16.16% | 16.16% |