About: Murexide test

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The murexide test is an analytical technique to identify the presence of caffeine and other purine derivatives in a sample. These compounds do not respond to the common alkaloid detecting tests such as Dragendorff's reagent. In this test the alkaloids are mixed with a tiny amount of potassium chlorate and a drop of hydrochloric acid. The sample is then evaporated to dryness and the resulting residue is exposed to ammonia vapour. Purine alkaloids produce a pink color in this test. Murexide (ammonium purpurate) with a purple color is also produced in this test.

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dbo:abstract
  • Die Murexid-Reaktion ist eine chemische Nachweisreaktion auf Purin, Harnsäure, Xanthin und von ihnen abgeleitete chemische Verbindungen wie Coffein, Theophyllin und Theobromin. Als Endprodukt der Reaktion entsteht das im alkalischen Milieu tiefviolett gefärbte Ammoniumsalz der Purpursäure, das Murexid, bzw. seine N-methylierten Derivate. (de)
  • The murexide test is an analytical technique to identify the presence of caffeine and other purine derivatives in a sample. These compounds do not respond to the common alkaloid detecting tests such as Dragendorff's reagent. In this test the alkaloids are mixed with a tiny amount of potassium chlorate and a drop of hydrochloric acid. The sample is then evaporated to dryness and the resulting residue is exposed to ammonia vapour. Purine alkaloids produce a pink color in this test. Murexide (ammonium purpurate) with a purple color is also produced in this test. (en)
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  • 43779604 (xsd:integer)
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  • 1899 (xsd:nonNegativeInteger)
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  • 1079291724 (xsd:integer)
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dbp:date
  • September 2014 (en)
dbp:reason
  • Needs a clarification concerning which types of compounds give a pink color and which give a purple color (en)
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  • Die Murexid-Reaktion ist eine chemische Nachweisreaktion auf Purin, Harnsäure, Xanthin und von ihnen abgeleitete chemische Verbindungen wie Coffein, Theophyllin und Theobromin. Als Endprodukt der Reaktion entsteht das im alkalischen Milieu tiefviolett gefärbte Ammoniumsalz der Purpursäure, das Murexid, bzw. seine N-methylierten Derivate. (de)
  • The murexide test is an analytical technique to identify the presence of caffeine and other purine derivatives in a sample. These compounds do not respond to the common alkaloid detecting tests such as Dragendorff's reagent. In this test the alkaloids are mixed with a tiny amount of potassium chlorate and a drop of hydrochloric acid. The sample is then evaporated to dryness and the resulting residue is exposed to ammonia vapour. Purine alkaloids produce a pink color in this test. Murexide (ammonium purpurate) with a purple color is also produced in this test. (en)
rdfs:label
  • Murexid-Reaktion (de)
  • Murexide test (en)
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