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Specific Reactions for Carbohydrates (Preliminaries)
• Preparation of solid unknown sugar in 5 mL of distilled water
Mucic Acid Test
• Test to identify Galactose and Lactose• The nitric acid oxidizes galactose to an isomer of
tetrahydroxyadipic (tetrahydroxyhexanedioic) acid that crystallizes out from water under the conditions of the test.
• Lactose is a disaccharide, galactosyl(1->4)glucose. The nitric acid first catalyzes hydrolysis of lactose to glucose and galactose. Then the nitric acid oxidizes both of those sugars to the tetrahydroxy acids. Mucic acid crystallizes out, which is a positive test. The acid from glucose remains in solution.
• This test will give positive results if there is a presence of crystal precipitate
Mucic Acid testXYL FRU GLU GAL LAC MAL SUC
1 Clear Solution
Clear Solution
Clear Solution
Clear Solution
With White Crystals
Clear Solution
With White Crystals
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2 Clear Solution
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With White Crystals
Clear Solution
With White Crystals
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3 Clear Solution
Clear Solution
Clear Solution
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With White Crystals
Clear Solution
With White Crystals
Clear Solution
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4 Clear Solution
Clear Solution
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With White Crystals
Clear Solution
With White Crystals
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Clear Solution
5 Clear Solution
Clear Solution
Clear Solution
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With White Crystals
Clear Solution
With White Crystals
Clear Solution
Clear Solution
Mucic Acid testXYL FRU GLU GAL LAC MAL SUC
6 Clear Solution
Clear Solution
Clear Solution
Clear Solution
With White Crystals
Clear Solution
With White Crystals
Clear Solution
Clear Solution
7Clear
SolutionClear
SolutionClear
SolutionClear
SolutionWith White
Crystals
Clear Solution
With White Crystals
Clear Solution
Clear Solution
8 Clear Solution
Clear Solution
Clear Solution
Clear Solution
With White Crystals
Clear Solution
With White Crystals
Clear Solution
Clear Solution
9 Clear Solution
Clear Solution
Clear Solution
Clear Solution
With White Crystals
Clear Solution
With White Crystals
Clear Solution
Clear Solution
10 Clear Solution
Clear Solution
Clear Solution
Clear Solution
With White Crystals
Clear Solution
With White Crystals
Clear Solution
Clear Solution