Structural studies and physiological activity of lemnan, a pectin fromLemna minor L |
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Authors: | R. G. Ovodova V. V. Golovchenko A. S. Shashkov S. V. Popov Yu. S. Ovodov |
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Affiliation: | (1) Institute of Physiology, Komi Science Center, Ural Branch, Russian Academy of Sciences, ul. Pervomaiskaya 50, 167982 Syktyvkar, Russia;(2) Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninskii pr. 47, 117913 Moscow, Russia |
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Abstract: | A pectic polysaccharide, lemnan, was isolated from freshly collected duckweedLemna minor L. Its sugar chain was shown to be mainly composed of the residues ofD-galacturonic acid (64%), galactose, arabinose, xylose, andD-apiose, a branched chain sugar. The high content ofD-apiose (25%) indicated that lemnan is an apiogalacturonan type pectin similar to zosteran, a pectic polysaccharide from a sea phanerogam of the Zosteraceae family. The results of partial acidic hydrolysis, pectinase digestion, and NMR studies of lemnan demonstrated that its macromolecule contains regions of the linear α-1,4-D-galacturonan and branched apiogalacturonan. The side chains of apiogalacturonan were found to be formed of single and 1,5-linked residues ofD-apiofuranose attached to 2- and 3-positions of theD-galacturonic acid residues of the apiogalacturonan backbone. Lemnan was shown to exhibit an immunomodulatory effect activating the system of phagocytosis. |
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Keywords: | apiogalacturonans immunomodulators Lemna minor L. lemnan NMR spectroscopy of pectins pectins plant polysaccharides |
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