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Investigation of structural features of the pectic polysaccharides of onion by 13C-n.m.r. spectroscopy

✍ Scribed by Peter Ryden; Ian J. Colquhoun; Robert R. Selvendran

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
335 KB
Volume
185
Category
Article
ISSN
0008-6215

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✦ Synopsis

The Na,CO,-soluble pectic polysaccharides of mature onions were separated by anion-exchange chromatography, and the structural features of two of the pectic polysaccharides were examined by methylation analysis and t3C-n.m.r. spectroscopy. The oligosaccharide side-chains containing j3-o-galactose were (1+4)-linked and were shown to have an average, d.p. of 7-8 by methylation analysis and 8-9 by n.m.r. spectroscopy. The a-L-arabinose side-chains were (l-+5)-linked and had an average d.p. of 3, as shown by methylation analysis, but it was not possible to obtain a value from the n.m.r. data.

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