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KMID : 1007519940030030137
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Food Science and Biotechnology
1994 Volume.3 No. 3 p.137 ~ p.143
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Core Structure of the Anti-Complementary Acidic Polysaccharide (PA-IIa-1) Isolated from Water Extract of Pteridium aquilinum var. lafiusculum
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Kweon, Mee-Hyang
Kim, Hyuk-Il/Sung, Ha-Chin/Yang, Han-Chul
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Abstract
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CrO₃-oxidated, de-esterified, and carboxyl-reduced products of PA-Ⅱa-1 were methylated to investigate the anomerization and glycosidic linkage composition. In native PA-Ⅱa-1, 2-linked Xylf, 5-linked Xylf, and 2-linked Fucf residues existed as methyl esters. Most α-mannosyl and β-glucuronosyl residues were observed as pyranoses. Most xylosyl and fucosyl residues had β-configuration, whereas galactosyl residues had both a-and β-configurations. CS-1, a periodate-resistant back bone, was obtained from the periodate oxidation and controlled Smith degradation of PA-Ⅱa-1. It was either hexa- or heptasac-charide and was composed of D-mannose and D-glucuronic acid in the molar ratio of 5.65 : 1.57. By combining results from ¹H- and ^(13)C-NMR spectroscopy, methylation analyses using GLC and GC/MS, and two dimensional ¹H-¹H COSY analysis, the structure of CS-1 was deduced as a β-D-glucurono-α-D-(1→2)-linked mannan.
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KEYWORD
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