Uronic acid

Structure of Beta-D-Glucuronic acid

Structure of Beta-D-Glucose

Uronic acids are a class of sugar acids with both a carbonyl and a carboxylic acid functional group. They are derived from monosaccharides by oxidation of the terminal hydroxyl group to a carboxylic acid. Uronic acids are important in the metabolism of carbohydrates and are found in many polysaccharides.

Structure and Properties

Uronic acids are characterized by the presence of a carboxylic acid group at the terminal carbon of the sugar molecule. This modification increases the molecule's solubility in water and alters its chemical reactivity. The most common uronic acids are derived from hexoses, such as glucose and galactose.

Biological Role

Uronic acids play a crucial role in the metabolism of carbohydrates. They are involved in the detoxification of substances in the liver through the formation of glucuronides, which are more water-soluble and can be excreted in the urine.

Examples

• Glucuronic acid is a prominent uronic acid derived from glucose. It is a key component of glycosaminoglycans, such as hyaluronic acid and chondroitin sulfate, which are important for the structure and function of connective tissues.
• Galacturonic acid is derived from galactose and is a major component of pectin, a polysaccharide found in the cell walls of plants.

Related Compounds

Uronic acids are related to other sugar acids, such as aldonic acids and aldaric acids, which are formed by oxidation of different carbon atoms in the sugar molecule.

Related Pages

• Carbohydrate metabolism
• Glucuronidation
• Polysaccharide