Definition of Aldonic Acid

Aldonic acid is a product that is formed due to the oxidation of the aldehyde group present in the Aldo sugar. The oxidation of the aldehyde group always yields a carboxylic acid. On the contrary, the reduction of a carboxylic acid leads to the formation of an aldehyde.


When the hydroxyl group present in the aldose are oxidized, uronic acid is produced, and when both the groups i.e. carbonyl and hydroxyl are oxidized, and Alaric acid is produced. The aldonic acids are present in a number of biological systems. Aldonic and uronic acids are known to be physiologically very important sugar acids.

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