Abstract
A heptasaccharide was released from the plant cell-wall, pectic polysaccharide rhamnogalacturonan II by selective acid hydrolysis of the glycosidic linkages of apiosyl residues. The heptasaccharide was purified to homogeneity by gel filtration and anion-exchange chromatography. Some of the heptasaccharide molecules were found to be mono- and some di- O-acetylated, but the location of the acetic ester groups was not determined. The heptasaccharide was found to have the following structure, where AceA = an aceryl (3- C-carboxy-5-deoxy- l-xylosyl) residue, and Api = an apiose residue. ▪
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