Sugar acid


A Sugar acid or acidic sugar is a monosaccharide with a carboxyl group at one end or both ends of its chain.[1]

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 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.
An ulosonic acid; specifically, 3-Deoxy-D-manno-oct-2-ulosonic acid


Examples of sugar acids include:

The β-D form of glucuronic acid


  1. ^ Robyt, J.F. (1998). Essentials of carbohydrate chemistry. New York: Springer. ISBN 0-387-94951-8.
  2. ^ Davies Michael B.; Austin John; Partridge David A. (1991). Vitamin C: Its Chemistry and Biochemistry. The Royal Society of Chemistry. p. 48. ISBN 0-85186-333-7.

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