Table 2 Preliminary phytochemical screening of crude root, root bark, and root tuber extracts of Acanthus polystachyus, Keetia gueinzii, and Rhynchosia elegans respectively
Plant metabolite | Tests | Root extracts of Acanthus polystachyus | Root bark extracts of Keetia gueinzii | Root tuber extracts of Rhynchosia Elegans | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Aqueous | Acetone | Methanol | Aqueous | Acetone | Methanol | Aqueous | Acetone | Methanol | ||
Alkaloids | Dragendorrf’s test | − | + | + | − | − | + | − | + | − |
Flavonoids | Alkaline reagent test | − | + | + | + | − | − | − | − | − |
Glycosides | Keller-killiani test | + | + | + | + | + | − | − | + | − |
Phenols | Ferric chloride test | + | + | + | + | + | + | + | + | + |
Saponins | Froth test | + | − | + | + | − | + | + | − | + |
Tannins | Ferric chloride test | + | − | − | + | + | + | + | + | − |
Terpenoids | Salkowski test | − | − | + | − | − | − | + | − | − |