Table 2.
Antibacterial activities against A. baumannii of leaf extracts from Zimbabwean medicinal plants.
| Plants | Solvent of extraction (% yield) | MIC (µg/mL) | MBC (µg/mL) |
|---|---|---|---|
| Combretum apiculatum ∗ | Hexane (2) | 500 MBC | >1000 |
| DCM (5.11) | 500 MBC | >1000 | |
| Acetone (4.49) | 125 MBC | >1000 | |
| Methanol (11.35) | 250 MBC | >1000 | |
| DCM-methanol | — | — | |
| Water-ethanol | — | — | |
| Ethyl acetate | — | — | |
| Water | — | — | |
|
| |||
| Combretum molle | DCM (3.18) | 1000 | — |
| Acetone (2.30) | 1000 | — | |
| Ethyl acetate (1.13) | 1000 | — | |
| DCM-methanol | — | — | |
| Water-ethanol | — | — | |
| Ethyl acetate | — | — | |
| Methanol | — | — | |
| Water | — | — | |
|
| |||
| Combretum zeyheri | Acetone (1.20) | 1000 | — |
| Methanol (3.30) | 1000 | — | |
| Ethanol (2.80) | 1000 | — | |
| DCM | — | — | |
| Ethyl acetate | — | — | |
| DCM-methanol | — | — | |
| Water-ethanol | — | — | |
| Water | — | — | |
|
| |||
| Callistemon citrinus | Water (2.72) | 1000 | — |
| Acetone | — | — | |
| Methanol | — | — | |
| DCM | — | — | |
| Ethanol | — | — | |
| Ethyl acetate | — | — | |
| DCM-methanol | — | — | |
| Water-ethanol | — | — | |
|
| |||
| Erythrina abyssinica leaf | Methanol (2.3) | 500 | >1000 |
| Acetone | — | — | |
| Water | — | — | |
| DCM | — | — | |
| Ethanol | — | — | |
| Ethyl acetate | — | — | |
| DCM-methanol | — | — | |
| Water-ethanol | — | — | |
|
| |||
| Syzygium guineense | Ethyl acetate (3.5) | 500 | >1000 |
| DCM (1.0) | 1000 | — | |
| Acetone | — | — | |
| Water | — | — | |
| Methanol | — | — | |
| Ethanol | — | — | |
| DCM-methanol | — | — | |
| Water-ethanol | — | — | |
|
| |||
| Parinari curatellifolia | Methanol (3.31) | 1000 | — |
| Ethanol | — | — | |
| DCM-methanol | — | — | |
| Water-ethanol | — | — | |
| DCM | — | — | |
| Acetone | — | — | |
| Water | — | — | |
| Ethyl acetate | — | — | |
|
| |||
| Combretum platypetalum | Methanol | — | — |
| Ethanol | — | — | |
| DCM-methanol | — | — | |
| Water-ethanol | — | — | |
| DCM | — | — | |
| Acetone | — | — | |
| Water | — | — | |
| Ethyl acetate | — | — | |
> Signifies a value greater than the stated value. ∗ In all cases of the 4 extracts from C. apiculatum, the minimum bactericidal concentration (MBC) was above 1000 µg/mL for all the solvent extracts, whilst acetone, methanol, DCM, and hexane extracts' MICs were 125, 250, 500, and 500 µg/mL each, respectively. This shows that the extracts can inhibit the growth but are not able to kill the bacteria up to 1000 µg/mL.