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Isolation and an N.M.R. study of pectins from flax (linum usitatissimum L.)

✍ Scribed by Eugenia A. Davis; Christiane Derouet; Catherine Herve Du Penhoat; Claudine Morvan

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
704 KB
Volume
197
Category
Article
ISSN
0008-6215

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✦ Synopsis

ABsTRAcr

The EDTA-extracted pectins from flax, which were fractionated by exclusion chromatography according to size, contained galactose, galacturonic acid, rhamnose , glucose, and traces of arabinose. The main components of the major fraction, a high-molecular-weight galactan, were +4)-p-Galp-(l+ chains and &Galp non-reducing terminal units according to 1D 'H-and 13C-n.m.r. analysis. The low-molecular-weight fractions contained notable amounts of rhamnose and galacturonic acid. On the basis of multipulse n.m.r. (CHORTLE, COSY, and NOESY), a rhamnogalacturonan structure of type I with @Galp units attached to the HO-4 of rhamnose can be proposed. This polymer probably constitutes the backbone of the highmolecular-weight polysaccharides.

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