Research Article
Exploiting of Green Synthesized Metal Oxide Nanoparticles in the Potentiometric Determination of Metformin Hydrochloride in Pharmaceutical Products
Table 1
Qualitative determination for preliminary phytochemicals in the millet extract.
| Phytochemicals | Chemical test | Positive indication sign |
| Flavonoids | Sodium hydroxide few drops and few drops of hydrochloric acid | Deep yellow color was removed by few drops of hydrochloric acid | Alkaloids | Dragendorff reagent | Orange or red precipitate | Tannins | Ferric chloride (1%) | Blackish blue color | Saponin | Foam test | Foam more than 1 cm | Terpenoids | Salkowski’s test | Reddish-brown precipitate | Phenols | Bromine water | White precipitate | Proteins | Biuret test, copper sulfate solution | | Carbohydrates | Tollen’s reagent | Silver mirror |
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