Structural elucidation of a novel fucogalactan that contains 3-O-methyl rhamnose isolated from the fruiting bodies of the fungus,Hericium erinaceus

摘要

A new heteropolysaccharide,HEPF3,was isolated from the fruiting bodies of Hericium erinaceus.HEPF3 has a molecular weight of 1.9 x 10~4 Da and is composed of fucose and galactose in a ratio of 1:4.12.Compositional analysis,methylation analysis,together with ~1H and ~(13)C NMR spectroscopy established that HEPF3 consists of a branched pentasaccharide repeating unit with the following structure:alpha-L-Fucp 1->2->6)-alpha-D-Galp-(1->6)-alpha-D-Galp-(1-> 6)-alpha-D-Galp-(1->HEPF3 also contains a minor proportion of 3-O-methylrhamnose that is thought to terminate the polymer main chain.