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Table 2 Preliminary phytochemical screening of crude root, root bark, and root tuber extracts of Acanthus polystachyus, Keetia gueinzii, and Rhynchosia elegans respectively

From: Qualitative and quantitative phytochemical composition, antimicrobial activity, and brine shrimp cytotoxicity of different solvent extracts of Acanthus polystachyus, Keetia gueinzii, and Rhynchosia elegans

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 + +
  1. + : metabolite present; −: metabolite absent