what is alkaloid reagent?
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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.
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There are a number of substances which are termed "alkaloidal reagents" which precipitate alkaloids from their aqueous or acid solu- tions. These are tannic acid, potassium-mercuric iodide, phosphomolybdic acid, picric acid, iodine in potassium iodide solution, and phosphotungstic acid.
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