Dragendorff's reagent

Dragendorff's reagent is a color reagent to detect alkaloids in a test sample or as a stain for chromatography plates. Alkaloids, if present in the solution of sample, will react with Dragendorff's reagent and produce an orange or orange-red precipitate. Dragendorff's reagent does not detect all alkaloids. For example, caffeine and other purine alkaloids do not form precipitates with this reagent. This reagent was invented by the German pharmacologist, Johann Georg Dragendorff (1836–1898) at the Imperial University of Dorpat.

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