Table 3.
Antibacterial activity of crude phenolic rich extracts (CPREs) (2000 µg/mL) from three plants against pathogenic bacteria using agar well diffusion assays.
| Microorganisms | Inhibition Zone (mm) | ||
|---|---|---|---|
| H. sabdariffa | B. oleracea | B. vulgaris | |
| Gram positive bacteria | |||
| S. aureus | 48 ± 8.0 | 38 ± 3.0 a | 24 ± 4.0 a |
| St. pyogenes | 40 ± 5.0 b | 32 ± 2.0 b | 10 ± 2.0 b |
| L. monocytogenes | 32 ± 4.0 c | 37 ± 3.0 a | 13 ± 3.0 b |
| Gram negative bacteria | |||
| E. coli | 46 ± 6.0 a | 28 ± 0.50 c | 7 ± 0.50 c |
| K. pneumonia | 48 ± 6.5 a | 30 ± 2.0 b | 18 ± 2.0 a |
| P. aeruginosa | 32 ± 3.0 c | 29 ± 0.50 c | 7 ± 0.50 c |
Means in the same column having different letters are significantly different (p ≤ 0.05).