Table 2 Yield of extract, Minimum Inhibitory Concentration (MIC) and total antibacterial activity (TAA) of the nine selected acetone leaf extracts against Gram-negative test bacteria. Values equal to or less than 0.1 mg/ml indicate high activity
| Â | Escherichia coli | Pseudomonas aeruginosa | Salmonella Typhimurium | ||||
|---|---|---|---|---|---|---|---|
Plant | % yield | MIC (mg/ml) | TAA (ml/g) | MIC (mg/ml) | TAA (ml/g) | MIC (mg/ml) | TAA (ml/g) |
Eugenia erythrophylla | 18.50 | 0.10 ± 0.05 | 1778.85 | 0.16 ± 0.00 | 1185.90 | 0.31 ± 0.00 | 591.05 |
Eugenia natalitia | 9.40 | 0.16 ± 0.00 | 602.56 | 0.08 ± 0.00 | 1205.13 | 0.16 ± 0.00 | 602.56 |
Eugenia woodii | 9.80 | 0.16 ± 0.00 | 628.21 | 0.16 ± 0.00 | 628.21 | 0.08 ± 0.00 | 1256.41 |
Eugenia umtamvunensis | 8.77 | 0.31 ± 0.00 | 281.15 | 0.16 ± 0.00 | 564.10 | 0.31 ± 0.00 | 281.15 |
Eugenia zeyheri | 25.33 | 0.13 ± 0.05 | 1946.15 | 0.31 ± 0.00 | 808.31 | 0.16 ± 0.00 | 1621.79 |
Syzygium legatii | 9.23 | 0.08 ± 0.00 | 1179.49 | 0.08 ± 0.00 | 1179.49 | 0.04 ± 0.00 | 2358.97 |
Syzygium masukuense | 10.50 | 0.08 ± 0.00 | 1346.15 | 0.08 ± 0.00 | 1346.15 | 0.08 ± 0.00 | 1346.15 |
Syzygium species A | 10.65 | 0.08 ± 0.00 | 1371.79 | 0.08 ± 0.00 | 1371.79 | 0.04 ± 0.00 | 2743.59 |
Syzygium gerrardii | 17.00 | 0.31 ± 0.00 | 544.00 | 0.16 ± 0.00 | 1088.00 | 0.04 ± 0.00 | 4352.00 |
Gentamicin | NA | 0.0008 | NA | 0.0003 | NA | 0.0002 | NA |
Average for extracts | NA | 0.16 ± 0.09 | NA | 0.14 ± 0.07 | NA | 0.13 ± 0.38 | NA |