Table 1.
Minimum inhibitory concentration values (MIC, mg/mL) of Protea caffra extracts screened against drug-sensitive and -resistant bacterial strains.
| Minimum Inhibitory Concentration (MIC, mg/mL) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Methanol | Dichloromethane | Petroleum Ether | |||||||||||
| Plant Part | Ec | Ef | Kp | Sa | Sa D | Ec | Ef | Kp | Sa | Ec | Ef | Kp | Sa |
| Bark | 1.25 | 0.63 | >2.5 | 0.31 | >2.5 | 1.25 | >2.5 | 2.5 | 1.25 | 1.25 | >2.5 | 2.5 | 1.25 |
| Flowers | 1.25 | 1.25 | 1.25 | 2.5 | 2.5 | 1.25 | 0.63 | 1.25 | 0.63 | 1.25 | 0.63 | 1.25 | 0.63 |
| Leaves | 2.5 | 0.63 | 1.25 | 1.25 | 0.63 | 2.5 | >2.5 | 1.25 | 2.5 | 2.5 | >2.5 | 1.25 | 2.5 |
| Seeds | 0.63 | 1.25 | 0.31 | 1.25 | 1.25 | 0.63 | 0.63 | 0.31 | 1.25 | 0.63 | 0.63 | 0.31 | 1.25 |
| Twigs | 0.63 | 0.31 | 0.63 | 0.31 | 0.63 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 | 2.5 |
| Neomycin a (µg/mL) | 0.78 | 0.39 | 1.6 | 0.65 | 6.25 | ||||||||
Ec = Escherichia coli; Ef = Enterococcus faecalis; Kp = Klebsiella pneumoniae; Sa = Staphylococcus aureus, Sa D = Penicillin-resistant S. aureus. MIC values bold-written indicate noteworthy antibacterial activity. a = Positive control.