Table 3.
antibacterial activity of M. macrantha roots as measured by disc and well diffusion methods
| Antibacterial screening method | Microorganism | Solvent | Extract concentration (μg/disc) (zones of inhibition in mm) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 100,000 μg/disc | F-ratio&, p-value# | 1,000 μg/disc | F-ratio&, p-value# | 500 μg/disc | F-ratio&, p-value# | 100 μg/disc | F-ratio&, p-value# | |||
| Disc diffusion method | S. aureus | Methanol | - | 414.82, <0.0001 | - | N/A | - | N/A | - | N/A |
| Ethanol | 11.3 ± 0.3 | - | - | - | ||||||
| Water | 6.8 ± 0.1 | - | - | - | ||||||
| Acetone | 9.2 ± 0.1 | - | - | - | ||||||
| E. coli | Methanol | 6.8 ± 0.1 | 397.93, <0.0001 | - | N/A | - | N/A | - | N/A | |
| Ethanol | 11.7 ± 0.3 | - | - | - | ||||||
| Water | - | - | - | - | ||||||
| Acetone | 8.5 ± 0.2 | - | - | - | ||||||
| S. typhi | Methanol | 8.5 ± 0.2 | 20.96, 0.0004 | - | 117.60, 0.0004 | - | N/A | - | N/A | |
| Ethanol | 10.0 ± 0.5 | 8.2 ± 0.2 | - | - | ||||||
| Water | 7.8± 0.4 | 6.8± 0.1 | - | - | ||||||
| Acetone | 10.0 ± 0.5 | - | - | - | ||||||
| Well diffusion method | S. aureus | Methanol | - | 42.00, 0.0003 | - | N/A | - | N/A | - | N/A |
| Ethanol | 12.0 ± 0.5 | - | - | - | ||||||
| Water | 14.0 ± 0.0 | - | - | - | ||||||
| Acetone | 15.0 ± 0.5 | - | - | - | ||||||
| E. coli | Methanol | 10.0 ± 0.5 | 376.68, <0.0001 | - | N/A | - | N/A | - | N/A | |
| Ethanol | 17.3 ± 0.3 | - | - | - | ||||||
| Water | - | - | - | - | ||||||
| Acetone | 12.0 ± 0.0 | - | - | - | ||||||
| S. typhi | Methanol | 12.3 ± 0.3 | 468.44, <0.0001 | 10.7 ± 0.3 | 124.00, <0.0001 | - | N/A | - | N/A | |
| Ethanol | 14.7 ± 0.3 | 14.3 ± 0.3 | - | |||||||
| Water | 11.3 ± 0.3 | 11.3 ± 0.3 | - | - | ||||||
| Acetone | 19.7 ± 0.3 | - | - | - | ||||||
-: no inhibition; N/A: not applicable; & and #: calculations were done using ordinary one-way ANOVA (with a statistical significance at p<0.05)