D-Galacturonic acid

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d-Galacturonic acid
Galacturonic acid.png
IUPAC name
(2S,3R,4S,5R)-2,3,4,5-tetrahydroxy-6-oxo-hexanoic acid
3D model (JSmol)
ECHA InfoCard 100.035.495
EC Number
  • 211-682-6
Molar mass 194.139
Melting point 159 °C (318 °F; 432 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

d-Galacturonic acid is a sugar acid, an oxidized form of d-galactose. It is the main component of pectin, in which it exists as the polymer polygalacturonic acid.[1] In its open form, it has an aldehyde group at C1 and a carboxylic acid group at C6. Other oxidized forms of d-galactose are d-galactonic acid (carboxylic group at C1) and meso-galactaric acid (mucic acid) (carboxylic groups at C1 and C6). It is also a uronic acid or hexuronic acid. Naturally occurring uronic acids are d-glucuronic acid, d-galacturonic acid, l-iduronic acid and d-mannuronic acid.


  1. ^ Debra Mohnen "Pectin structure and biosynthesis" Current Opinion in Plant Biology 2008, 11:266–277. doi:10.1016/j.pbi.2008.03.006.