TABLE 4.
Antimicrobial activity of extracts of Coelogyne cristata and C. fimbriata as recorded in the bioassays carried out in this study of five plants per species grown in greenhouses.
| Extracts | Zone of inhibition (mm) | ||||
| Bacillus cereus | Escherichia coli | Klebsiella pneumoniae | Staphylococcus aureus | Yersinia enterocollitica | |
| Positive control (7.5 μg/ml levofloxacin) | 22.87 ± 1.0 | 13.12 ± 0.2 | 22 ± 2.2 | 14.6 ± 0.6 | 38 ± 1.5 |
| 70% EtOH pseudobulbs C. cristata | — | — | — | — | — |
| 70% EtOH leaves C. cristata | — | — | — | — | — |
| Hexane pseudobulbs C. cristata | — | — | — | — | — |
| Hexane leaves C. cristata | — | — | — | — | — |
| 70% EtOH pseudobulbs C. fimbriata | — | — | — | — | — |
| 70% EtOH leaves C. fimbriata | 15.55 ± 0.6 | 13.88 ± 0.7 | 18.55 ± 0.6 | 13.3 ± 1.0 | 21.7 ± 2.0 |
| Hexane pseudobulbs C. fimbriata | — | — | — | — | — |
| Hexane leaves C. fimbriata | — | — | — | — | — |
All experiments were carried out in triplicate. Absence of growth inhibition is indicated with —