Table 1.
Phytochemical | Name of the tests | Observed changes | Result |
---|---|---|---|
Alkaloids | Mayer's test | Creamy white precipitate | − |
Hager's test | Yellow crystalline precipitate | + | |
Wagner's test | Brown or deep brown precipitate | − | |
Dragendorff's test | Orange or orange-red precipitate | − | |
Tannic acid test | Buff color precipitate | − | |
Carbohydrates | Molisch's test | A red or reddish violet ring is formed at the junction of two layers and on shaking a dark purple solution is formed | + |
Barfoed's test (general test for monosaccharides) | Red precipitate | − | |
Fehling's test | A red or brick-red precipitate | − | |
Benedict's test | + | ||
Test for combined reducing sugar | A brick-red precipitate | − | |
Glycosides | General test | Yellow color | − |
Bromine water test | yellow precipitate | + | |
Test for glucoside | Production of brick-red precipitation (carried out with the hydrolyzed extract) | − | |
Flavonoids | Alkaline reagent test | Red color | +/− |
Shinoda test (magnesium hydrochloride reduction test) | Green to blue color | + | |
Zinc hydrochloride reduction test | Red color after few minutes | − | |
Saponins | Frothing test | Formation of stable foam | + |
Steroids | Libermann-Burchard's test | Greenish color | − |
Tannins | Lead acetate test | A yellow or red precipitate | + |
Ferric chloride test | Blue green color | − | |
Alkaline reagent test | Yellow to red precipitate | + | |
Terpenoids | Salkowski test | Yellow color appears at the lower layer | − |
(+) = presence; (−) = absence; (+/−) = presence or absence not ascertained.