Chemical Structures of Main Extracellular Polysaccharides of Alternaria solani and Fusarium solani. Studies on Fungal Polysaccharides. XVIII
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Major water-soluble extracellular polysaccharides of A. solani obtained by DEAE-cellulose column fractionation, ASP-1 and ASP-2 were heteroglycans which were composed of D-galactose, D-glucose and D-mannose. The molar ratios of ASP-1 and ASP-2 were 2.2 : 3.1 : 1.0 and 1.0 : 1.7 : 2.0,respectively. FSP-1 obtained from F. solani was a heteroglycan composed of D-galactose, D-glucose, D-mannose, and small amounts of glucuronic acid and rhamnose (approximate molar ratio : 10.5 : 10.6 : 7.6 : 1.8 : 1.0). Optical rotations of these glycans were [α]^<25>_D+66.0°(ASP-1), [α]^<25>_D+38.0°(ASP-2), and [α]^<25>_D+25°(FSP-1), respectively. The results of periodate oxidation, Smith-degradation, methylation studies, and Gas-liquid Chromatography-Mass Spectrum spectra showed that these polysaccharides have highly branched structure and 1,2-, 1,3-, and 1,6-linked glucopyranosyl (ASP-1), 1,2-linked mannopyranosyl and 1,6-linked glucopyranosyl (ASP-1), and 1,2-linked glucopyranosyl and 1,3,6-linked mannopyranosyl residues (FSP-1), and 1,2,6-linked galactofuranosyl residues are present as main linkages of each glycan. The terminal groups are glucopyranosyl and small amount of mannopyranosyl residues. Probable structures are proposed.
- 公益社団法人日本薬学会の論文
- 1975-08-25
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