Pectins, also known as pectic polysaccharides, contain a high concentration of galacturonic acid. Within the pectic group, several distinct polysaccharides have been identified and characterised. Homogalacturonans are -(1-4)-linked D-galacturonic acid linear chains. Substituted galacturonans are distinguished by the presence of saccharide-dependent residues (such as D-xylose or D-apiose in the case of xylogalacturonan and apiogalacturonan, respectively) branching from a D-galacturonic acid backbone. Pectin Market Rhamnogalacturonan I pectins (RG-I) have a repeating disaccharide backbone: 4-D-galacturonic acid (1,2) -α-L-rhamnose-( 1. Sidechains of various neutral sugars branch off from many of the rhamnose residues. The neutral sugars are mostly D-galactose, L-arabinose, and D-xylose, with the types and proportions varying depending on the origin of the pectin.
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