Sixteen preparation of the
ethanol and aqueous extracts of four edible plants, Entada africana
(bark),Terminalia avicennoides (bark),Mitragyna stipulosa
(bark) Lannae acida (stem bark) were screened for their inhibitory
effects on ten strains of E coli 0157:H7 (EHEC) using the agar
diffusion method. It was shown that ethanol extracts of Entanda africana
inhibited all the ten strains used, some extracts showed variable
antibacterial activities while some others could not cause any inhibition.
The minimum inhibitory concentration (MIC) of the potent extracts ranged
from 1.56mg/ml to 50.00mg/ml while the minimum bacteriocidal concentration
(MBC) was between 6.25mg/ml to 25.00mg/ml. Pytochemical screening of
the extracts revealed that all contained saponin. Some showed presence
of tannins and glycosides while alkaloid was not detected in all samples.