A Sugar acid or acidic sugar is a
monosaccharide Monosaccharides (from Greek '' monos'': single, '' sacchar'': sugar), also called simple sugars, are the simplest forms of sugar Sugar is the generic name for sweet-tasting, soluble carbohydrates, many of which are used in food. Simpl ...
with a carboxyl group at one end or both ends of its chain. Main classes of sugar acids include: * Aldonic acids, in which the aldehyde group (−CHO) located at the initial end ( position 1) of an aldose is oxidized. * Ulosonic acids, in which the −CH2(OH) group at the initial end of a 2-
ketose A ketose is a monosaccharide containing one ketone In organic chemistry, a ketone is a functional group with the structure R–C(=O)–R', where R and R' can be a variety of carbon-containing substituents. Ketones contain a carbonyl ...
is oxidized creating an α- ketoacid. * Uronic acids, in which the −CH2(OH) group at the terminal end of an aldose or ketose is oxidized. * Aldaric acids, in which both ends (−CHO and −CH2(OH)) of an aldose are oxidized.


Examples of sugar acids include: * Aldonic acids ** Glyceric acid (3C) ** Xylonic acid (5C) ** Gluconic acid (6C) **
Ascorbic acid Vitamin C (also known as ascorbic acid and ascorbate) is a water-soluble vitamin found in citrus and other fruits and vegetables, also sold as a dietary supplement and as a topical A topical medication is a medication that is applied ...
(6C, unsaturated lactone) * Ulosonic acids ** Neuraminic acid (5-amino-3,5-dideoxy-D- ''glycero''-D- ''galacto''-non-2-ulosonic acid) ** Ketodeoxyoctulosonic acid (KDO or 3-deoxy-D- ''manno''-oct-2-ulosonic acid) * Uronic acids ** Glucuronic acid (6C) ** Galacturonic acid (6C) ** Iduronic acid (6C) * Aldaric acids ** Tartaric acid (4C) ** ''meso''-Galactaric acid ( Mucic acid) (6C) ** D-Glucaric acid ( Saccharic acid) (6C)


External links

* {{MeshName, Sugar+Acids