O-acetylated oligosaccharides from pectins of potato tuber cell walls

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Abstract

Acetylated trigalacturonides and rhamnogalacturonan I (RG-I)-derived oligosaccharides were isolated from a Driselase digest of potato tuber cell walls by ion-exchange and size-exclusion chromatography. The oligosaccharides were structurally characterized by fast atom bombardment-mass spectroscopy, nuclear magnetic resonance spectroscopy, and glycosyl-linkage composition analysis. One trigalacturonide contained a single acetyl group at 0-3 of the reducing galacturonic acid residue. A second trigalacturonide contained two acetyl substituents, which were located on 0-3 or 0-4 of the nonreducing galacturonic acid residue and 0-3 of the reducing galacturonic acid residue. RG-I backbone-derived oligomers had acetyl groups at O-2 of the galacturonic acid residues. Some of these galacturonic acid residues were O-acetylated at both O-2 and O-3 positions. Rhamnosyl residues of RG-I oligomers were not acetylated.

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Ishii, T. (1997). O-acetylated oligosaccharides from pectins of potato tuber cell walls. Plant Physiology, 113(4), 1265–1272. https://doi.org/10.1104/pp.113.4.1265

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