
Chemical | |
Description | D-Galacturonicacidistheprincipalconstituentofpectin,butsomeneutralsugarsarealsocommonlypresentinpectin.TheD-galacturonicacidunitsarelinkedtogetherbyα(1-4)glycosidiclinkages.Thepolygalacturonicacidispartlyesterifiedwithmethylgroupsandthefreeacidgroupsmaybepartlyorfullyneutralizedwithsodium,potassiumorammoniumions.Theratioofesterifiedgalacturonicacidgroupstototalgalacturonicacidgroups-termedthedegreeofesterification(DE)-hasvitalinfluenceonthepropertiesofpectin,especiallythesolubilityandthegel-formingcharacteristics. |
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