Structure and physiological activity of lemnan, Lemna minor L. pectin |
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Authors: | Ovodova R G Golovchenko V V Shashkov A S Popov S V Ovodov Iu S |
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Institution: | Institute of Physiology, Komi Science Center, Ural Branch, Russian Academy of Sciences, ul. Pervomaiskaya 50, Syktyvkar, 167982 Russia. ovoys@physiol.komisc.ru |
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Abstract: | A pectic polysaccharide, lemnan, was isolated from freshly collected duckweed Lemna minor L. Its sugar chain was shown to be mainly composed of the residues of D-galacturonic acid (64%), galactose, arabinose, xylose, and D-apiose, a branched chain sugar. The high content of D-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 alpha-1,4-D-galacturonan and branched apiogalacturonan. The side chains of apiogalacturonan were found to be formed of single and 1,5-linked residues of D-apiofuranose attached to 2- and 3-positions of the D-galacturonic acid residues of the apiogalacturonan backbone. Lemnan was shown to exhibit an immunomodulatory effect by activating the system of phagocytosis. |
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