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


Examples of sugar acids include:

Ascorbic acid (Vitamin C)
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.