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. 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.
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... says... Rhamnogalacturonan I (RG1) is a Linear polymer of alternating galacturonic acid (GalA) and rhamnose (Rha) molecules -alpha-Rha-(1-->4)-alpha-GalA-(1-->2)-alpha-Rha-(1-->4)-a-GalA-(1-->2)--etcetc ...
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