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Seliwanoff’s test is a chemical test which distinguishes between aldose and ketose sugars. If the sugar contains a ketone group, it is a ketose. If a sugar contains an aldehyde group, it is an aldose. This test relies on the principle that, when heated, ketoses are more rapidly dehydrated than aldoses. It is named after Theodor Seliwanoff ...
The xanthoproteic reaction is a method that can be used to detect a presence of protein soluble in a solution, using concentrated nitric acid. The test gives a positive result in amino acids carrying aromatic groups, especially in the presence of tyrosine. If the test is positive the proof is neutralized with an alkali, turning dark yellow.
Theodor Seliwanoff (or Seliwanow), born as Fedor Fedorovic Selivanov (October 8, 1859 in Gorodischtsche, Pensa–1938) was a chemist who invented the Seliwanoff's test in 1887 while working in Metchnikow University of Odesa in Odessa, Russian Empire.
Ketoses and aldoses can be chemically differentiated through Seliwanoff's test, where the sample is heated with acid and resorcinol. [3] The test relies on the dehydration reaction which occurs more quickly in ketoses, so that while aldoses react slowly, producing a light pink color, ketoses react more quickly and strongly to produce a dark red ...
Seliwanoff's test; Semidine rearrangement; Semmler–Wolff reaction; Seyferth–Gilbert homologation; Shapiro reaction; Sharpless asymmetric dihydroxylation;
Product of the xanthoproteic reaction with the characteristic yellow color. Xanthoproteic acid is a non-crystallizable yellow substance derived from proteins upon treatment with nitric acid. [1] [2] Nitric acid reacts with proteins to form xanthoproteic acid. [1] This reaction is known as the xanthoproteic reaction. This test is carried out by ...
Ketoses and aldoses can be chemically differentiated through Seliwanoff's test, where the sample is heated with acid and resorcinol. [4] The test relies on the dehydration reaction which occurs more quickly in ketoses, so that while aldoses react slowly, producing a light pink color, ketoses react more quickly and strongly to produce a dark red color.
Generally, Benedict's test detects the presence of aldehyde groups, alpha-hydroxy-ketones, and hemiacetals, including those that occur in certain ketoses. In example, although the ketose fructose is not strictly a reducing sugar, it is an alpha-hydroxy-ketone which results to a positive test because the base component of Benedict converts it ...