Chemical Tests

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Chapter: Pharmacognosy and Phytochemistry : Drugs Containing Alkaloids

The chemical tests are performed from neutral or slightly acidic solution of drug.


CHEMICAL TESTS

 

 

The chemical tests are performed from neutral or slightly acidic solution of drug.

 

Dragendorff’s Test

 

Drug solution + Dragendroff’s reagent (Potassium Bismuth Iodide), formation of Orangish red colour.

 

Mayer’s Test

 

Drug solution + few drops of Mayer’s reagent (potassium mercuric iodide), formation of creamy-white precipitant.

 

Hager’s Test

 

Drug solution + few drops of Hagers reagent (Saturated aq. Solution of Picric acid), formation of crystalline yellow precipitate.

 

Wagner’s Test

 

Drug solution + few drops of Wagner’s reagent (dilute Iodine solution), formulation of reddish-brown precipitate.

 

Tannic Acid Test

 

Drug solution + few drops of tannic acid solution, formation of buff coloured precipitate.

 

Ammonia Reineckate Test

 

Drug solution + slightly acidified (HCl) saturated solution of ammonia reineckate, formation of pink flocculent precipitate.

 

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