Sugar acid

{{short description|Sugar molecule with an –OH group at the end(s) of the carbon chain}}

In organic chemistry, a sugar acid or acidic sugar is a monosaccharide with a carboxyl group at one end or both ends of its chain.{{cite book |title=Essentials of carbohydrate chemistry |author=Robyt, J.F. |publisher=Springer |location=New York |year= 1998

| url=https://books.google.com/books?id=l4NfU7_sAZoC&q=%22b.+Aldonic+acids%22&pg=PA366 |isbn=0-387-94951-8}}

Main classes of sugar acids include:

• Aldonic acids, in which the aldehyde group ({{chem2|\sCH\dO}}) located at the initial end (position 1) of an aldose is oxidized.
• Ulosonic acids, in which the hydroxymethyl group ({{chem2|\sCH2OH}}) at the initial end of a 2-ketose is oxidized creating an α-ketoacid.
• Uronic acids, in which the {{chem2|\sCH2OH}} group at the terminal end of an aldose or ketose is oxidized.
• Aldaric acids, in which both ends ({{chem2|\sCH\dO}} and {{chem2|\sCH2OH}}) of an aldose are oxidized.

File:D-Gluconsäure Keilstrich.svg]]	File:3-Deoxy-D-manno-oct-2-ulosonic acid linear.png]]	File:Beta D-Glucuronic acid.svg]]	File:Tartaric acid.svg]]