Molisch test

Molisch test
Mo·lisch test 'mō-lish- n a test for carbohydrate (as sugar) in which a reddish violet color is formed by reaction with alpha-naphthol in the presence of concentrated sulfuric acid called also Molisch reaction
Molisch Hans (1856-1937)
German botanist. Molisch's extensive studies of plants embraced several disciplines: comparative anatomy, morphology, physiology, and microchemistry. He devised his test for carbohydrate in 1886.

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1. (for glucose in urine) add 2 mL of urine, 2 drops of a 15 per cent solution of thymol, and an equal volume of strong sulfuric acid; a deep red color results. Called also Molisch reaction. 2. (for glucose in urine) to 1 mL of urine add 2 or 3 drops of a 5 per cent solution of α-naphthol in alcohol, then add 2 mL of strong sulfuric acid; a deep violet color is produced, and a violet precipitate follows if water is added. 3. (for proteins) the substance is treated with a 15 per cent alcoholic solution of α-naphthol and then with concentrated sulfuric acid; a violet color is formed if proteins are present. Called also Molisch reaction; defs. 2 and 3 called also alpha-naphthol reaction.

Medical dictionary. 2011.

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  • Molisch test — noun biochemical indicator of the presence of carbohydrates in a solution; if carbohydrates are present a violet ring is formed by reaction with alpha naphthol in the presence of sulfuric acid • Syn: ↑alpha naphthol test, ↑Molisch s test,… …   Useful english dictionary

  • Molisch test (reaction) — Mo·lisch test (reaction) (moґlish) [Hans Molisch, Czech botanist in Vienna, 1856–1937] see under test …   Medical dictionary

  • Molisch's test — (named after Austrian botanist Hans Molisch) is a sensitive chemical test for the presence of carbohydrates, based on the dehydration of the carbohydrate by sulfuric acid to produce an aldehyde, which condenses with two molecules of phenol… …   Wikipedia

  • Molisch reaction — noun biochemical indicator of the presence of carbohydrates in a solution; if carbohydrates are present a violet ring is formed by reaction with alpha naphthol in the presence of sulfuric acid • Syn: ↑alpha naphthol test, ↑Molisch s test,… …   Useful english dictionary

  • Molisch's test — noun biochemical indicator of the presence of carbohydrates in a solution; if carbohydrates are present a violet ring is formed by reaction with alpha naphthol in the presence of sulfuric acid • Syn: ↑alpha naphthol test, ↑Molisch test, ↑Molisch… …   Useful english dictionary

  • test — 1. To prove; to try a substance; to determine the chemical nature of a substance by means of reagents. 2. A method of examination, as to determine the presence or absence of a definite disease or of some substance in any of the fluids, tissues,… …   Medical dictionary

  • Molisch — Hans, Austrian chemist, 1856–1937. See M. test …   Medical dictionary

  • Molisch reaction — see under test …   Medical dictionary

  • alpha-naphthol test — noun biochemical indicator of the presence of carbohydrates in a solution; if carbohydrates are present a violet ring is formed by reaction with alpha naphthol in the presence of sulfuric acid • Syn: ↑Molisch s test, ↑Molisch test, ↑Molisch… …   Useful english dictionary

  • Réaction de Molisch — La réaction de Molisch est une réaction chimique qui démontre la présence dans une solution de tous les hydrates de carbone (glucides) comme, par exemple, les molécules sucrantes notamment (oses et diholosides). Elle consiste à mélanger la… …   Wikipédia en Français

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