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This test is one in which concentrated HNO3 is heated along with an aldose sugar to give a dicarboxylic acid. Nitric acid is able to oxidize the terminal groups of aldoses, but leaves the secondary hydroxyl groups unchanged. The dicarboxylic acid formed from galactose is called mucic acid and is insoluble in cold aqueous solution. Those acids formed from the other common sugars are soluble in H20. Thus the formation of the insoluble precipitate is an indication of the presence of galactose.

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What is mucic acid test?

The mucic acid test is a chemical test used to detect the presence of mucic acid in a substance. It involves the use of reagents that react with mucic acid to produce a characteristic color change. This test is commonly used in the identification of certain carbohydrates.


What is the positive result for mucic acid test?

Yes! :D Lactose is a dimer (molecule made of 2 similar units) of glucose and galactose. Mucic Acid is a result of the nitric acid oxidation of galactose. So since one of the monomers of lactose is galactose, it will give a positive mucic acid test.


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