Question:
Purine alkaloids are usually identified by using _____ test.
Purine alkaloids are usually identified by using _____ test.
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Purine (Caffeine) + Murexide = Purple color.
Updated On: May 19, 2026
- Molisch
- Murexide
- Borntragers
- Fehling's
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The Correct Option is B
Solution and Explanation
Step 1: Concept
Specific chemical tests are used to identify different classes of natural products.
Step 2: Meaning
Purine alkaloids include caffeine, theobromine, and theophylline.
Step 3: Analysis
The Murexide test involve heating the drug with potassium chlorate and hydrochloric acid, then exposing the residue to ammonia. A purple color indicates a positive result. Molisch is for carbohydrates, and Borntrager's is for anthraquinones.
Step 4: Conclusion
Murexide test is the definitive qualitative test for purine alkaloids.
Final Answer: (B)
Specific chemical tests are used to identify different classes of natural products.
Step 2: Meaning
Purine alkaloids include caffeine, theobromine, and theophylline.
Step 3: Analysis
The Murexide test involve heating the drug with potassium chlorate and hydrochloric acid, then exposing the residue to ammonia. A purple color indicates a positive result. Molisch is for carbohydrates, and Borntrager's is for anthraquinones.
Step 4: Conclusion
Murexide test is the definitive qualitative test for purine alkaloids.
Final Answer: (B)
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